KENNEDY SPACE CENTER, FLA. -- Peter Diamandis (left), founder of the Zero Gravity Corp., and noted physicist Stephen Hawking move away from Zero G's modified Boeing 727 on the runway at the Kennedy Space Center's Shuttle Landing Facility. Hawking enjoyed his first zero gravity flight provided by Zero G. At the celebration of his 65th birthday on January 8 this year, Hawking announced his plans for a zero-gravity flight to prepare for a sub-orbital space flight in 2009 on Virgin Galactic's space service. Photo credit: NASA/Kim Shiflett

Zero-g tests of involving Astronaut candidate Daniel C. Brandenstein. Brandenstein is shown flying in midair on the KC-135.

Zero-gravity experiments in KC-135 conducted by John Young, Robert L. Crippen, Joseph Kerwin, and Margaret Seddon. 1. Kerwin, Joseph - Zero-G 2. Seddon, Margaret - Zero-G 3. Young, John - Zero-G 4. Aircraft - KC-135

iss056e150242 (8/20/2018) --- A view of good and bad batteries within ziplock bags after Zero G battery testing aboard the International Space Station (ISS). The Zero-g Battery Testing is an initial study to investigate comments from Space Shuttle and International Space Station crew members to determine if batteries change due to zero-g. This is not intended to be an extensive study due to the short time frame available, and due to the availability of equipment.

KC-135 inflight training of the STS-30/61B Crew for suit donning doffing and Zero-G orientation for Rudolfo Neri, Astronaut Mary Cleave, and Ricardo Peralta, Backup Neri. 1. Astronaut Cleave, Mary - Zero-G 2. Neri, Rodolfo - Zero-G 3. Peralta, Ricard - Zero-G

KC-135 inflight training of the STS-30/61B Crew for suit donning doffing and Zero-G orientation for Rudolfo Neri, Astronaut Mary Cleave, and Ricardo Peralta, Backup Neri. 1. Astronaut Cleave, Mary - Zero-G 2. Neri, Rodolfo - Zero-G 3. Peralta, Ricard - Zero-G

KENNEDY SPACE CENTER, FLA. -- The media surround noted wheelchair-bound physicist Stephen Hawking after his arrival at the Kennedy Space Center Shuttle Landing Facility for his first zero-gravity flight. Behind Hawking, at left, are Zero Gravity Corporation founder Peter Diamandis and Space Florida president Steve Kohler. The flight will be aboard a modified Boeing 727 aircraft owned by Zero G, a commercial company licensed to provide the public with weightless flight experiences. Hawking developed amyotrophic lateral sclerosis disease in the 1960s, a type of motor neuron disease which would cost him the loss of almost all neuromuscular control. At the celebration of his 65th birthday on January 8 this year, Hawking announced his plans for a zero-gravity flight to prepare for a sub-orbital space flight in 2009 on Virgin Galactic's space service. Photo credit: NASA/Kim Shiflett

Views of STS-51E Crewman Senator Jake Garn during Zero-G Parabolas. 1. Senator E. J. "Jake" Garn - Zero-G

Views of STS-51E Crewman Senator Jake Garn during Zero-G Parabolas. 1. Senator E. J. "Jake" Garn - Zero-G

Views of STS-51E Crewman Senator Jake Garn during Zero-G Parabolas. 1. Senator E. J. "Jake" Garn - Zero-G

Views of STS-51E Crewman Senator Jake Garn during Zero-G Parabolas. 1. Senator E. J. "Jake" Garn - Zero-G

Teacher-in-Space trainees on the KC-135 for Zero-G training. Sharon Christa McAuliffe experiences a few moments of weightlessness provided by the KC-135. She and Bob Mayfield, a JSC Aerospace Education Specialist, are previewing a Molecular Mixing Experiment which was designed to demonstrate differences of separation process in 1-G and Zero-G.

Views of STS-51E PS Patrick Baudry during Zero-G Training Flights. 1. STS-51E - CREW TRAINING

Vestibular Study testing in Zero-G flights on the KC-135. Seen in this view are Roberta Bonder and others experiencing weightlessness.

S84-40538 (24 Aug 1984) --- Two 41-G payload specialists and a backup for one of them appear to be at home in zero gravity in this scene photographed aboard a KC-135 "Zero gravity" aircraft flying one of its weightlessness opportunity parabolas. Paul D. Scully-Power, a civilian oceanographer with the U.S. Navey, is flanked by Marc Garneau (left) and Robert Thirsk, both representing the National Research Council of Canada. Thirsk is back up payload specialist for Garneau.

S85-42473 (16 Oct. 1985) --- Sharon Christa McAuliffe, a teacher-citizen observer on STS-51L, smiles before participating in some zero-G rehearsals for her upcoming flight. She is seated near the controls of the KC-135 aircraft, flying for the Johnson Space Center from Ellington Air Field. Referred to as the ?zero-gravity? aircraft, the KC-135 provides brief moments of weightlessness for shuttle crew members in training. Photo credit: NASA

S85-42472 (16 Oct. 1985) --- Teacher-in-Space trainees on the KC-135 for zero-G training. Sharon Christa McAuliffe, right, and Barbara R. Morgan, play leap-frog in the temporary weightlessness of the KC-135. Photo credit: NASA

Spacesuit Donning and Doffing in Zero-G Training for Don Peterson of the STS-6 Crew with Astronaut Jerry Ross assisting; and, apparatus for testing the JSC Mechanically-Induced Settling Technology (MIST) Experiment. The training is being held aboard the KC-135 to simulate weightlessness. He is being assisted to don the lower torso of the Extravehicular Mobility Unit (EMU) by an ILC Technician. 1. ASTRONAUT ROSS, JERRY L. - ZERO-G SUITING 2. SHUTTLE - EXPERIMENTS (MIST)

Dr. von Braun inside the KC-135 in flight. The KC-135 provide NASA's Reduced-Gravity Program the unique weightlessness or zero-g environment of space flight for testing and training of human and hardware reactions. The recent version, KC-135A, is a specially modified turbojet transport which flies parabolic arcs to produce weightlessness periods of 20 to 25 seconds and its cargo bay test area is approximately 60 feet long, 10 feet wide, and 7 feet high.

S85-42470 (16 Oct. 1985) --- Sharon Christa McAuliffe, right, and Barbara R. Morgan, participating in the Teacher-in-Space Project, team up with Bob Mayfield, a JSC aerospace educations specialist, to preview some experiments in zero-G. A KC-135 aircraft flies a special pattern to provide series of brief periods of weightlessness. McAuliffe, prime crew member for STS-51L, injects a hydroponic solution into a cylinder to review one of the experiments planned for the flight. Morgan is backup for McAuliffe on that mission. Photo credit: NASA

STS 61-B crewmembers training on the KC-135 in zero-G. Views include Payload specialist Charles D. Walker attempting to down the lower torso of his extravehicular mobility unit (EMU) in zero-G in the KC-135. He is being assisted by other participants in the training (39135); Payload specialist Rodolfo Neri floating in midair during training in the KC-135 (39136,39138); Mission specialist Mary L. Cleave floating in midair during her training aboard the KC-135 (39137); Astronaut Bryan D. O'Connor assists Astronaut Sherwood C. Spring in completing his donning of the EMU in the KC-135 (39139); Technicians aid Spring with his EMU in the KC-135 (39140); O'Connor appears to be leaping up in zero-G aboard the KC-135 (39141); Astronaut Brewster Shaw is assisted by a technician to don his EMU (39142); Shaw is attempting to don the EMU gloves while O'Connor watches (39143); Shaw does jumping jacks while Neri attempts to travel down a rope guideline (39144).

S79-28602 (2 March 1979) --- Astronaut candidate Guion S. Bluford and Aviation Safety Officer Charles F. Hayes got a unique perspective of their environment during a zero gravity flight. They are aboard a KC-135 aircraft, which flies a special pattern repeatedly to afford a series of 30-seconds-of-weightlessness sessions. Bluford and Hayes are being assisted by C. P. Stanley of the photography branch of the photographic technology division at Johnson Space Center (JSC). Some medical studies and a motion sickness experiment were conducted on this particular flight. Bluford is one of 20 scientist-astronaut candidates who began training at JSC in July of 1978. Photo credit: NASA

S84-37536 (18 July 1984) --- Astronaut Robert L. Crippen, left, 41-G crew commander watches as one of his fellow crewmembers gets an introduction to weightlessness aboard a KC-135, "zero-gravity" aircraft. Paul D. Scully-Power is the crew member literally floating here in the brief period of micro-gravity. Scully-Power, an oceanographer with the U.S. Navy, and Marc Garneau (partially visible in chair behind the floating Scully-Power)are payload specialists for 41-G. Garneau represents the National Research Council (Canada).

S84-37514 (18 July 1984) --- Marc Garneau, representing Canada's National Research Council as one of two 41-G payload specialists, gets the "feel" of zero gravity aboard a special NASA aircraft designed to create brief periods of weightlessness. Five astronauts and an oceanographer from the U.S. Dept. of the Navy will join Canada's first representative in space for the trip aboard Challenger later this year. This KC-135 aircraft is used extensively for evaluation of equipment and experiments scheduled for future missions.

S85-44835 (20 Nov. 1985) --- This flying human chain represents prime and backup payload specialists for two upcoming STS missions. The group, representing trainees for STS-61C later this year and STS-51L early next year, shared some 40 parabolas in NASA?s KSC-135, ?Zero-G? aircraft on Nov. 20. Left to right are Gerard Magilton, RCA backup payload specialist for STS-61C; Sharon Christa McAuliffe, payload specialist/teacher citizen observer for STS-51L; U.S. Rep. Bill Nelson (D., Florida), scheduled for 61-C; Barbara R. Morgan, backup to McAuliffe; and Robert J. Cenker, RCA payload specialist for 61-C. The photo was taken by Keith Meyers, New York Times. Photo credit: NASA

KENNEDY SPACE CENTER, FLA. -- At the Kennedy Space Center Shuttle Landing Facility, noted physicist Stephen Hawking, in the wheelchair, arrives at the runway for his first zero-gravity flight. The flight will be aboard a modified Boeing 727 aircraft owned by Zero Gravity Corp., a commercial company licensed to provide the public with weightless flight experiences. At left is Peter Diamandis, founder of the Zero Gravity Corp. At center is Nicola O'Brien, a nurse practitioner who is Hawking's aide. Hawking developed amyotrophic lateral sclerosis disease in the 1960s, a type of motor neuron disease which would cost him the loss of almost all neuromuscular control. At the celebration of his 65th birthday on January 8 this year, Hawking announced his plans for a zero-gravity flight to prepare for a sub-orbital space flight in 2009 on Virgin Galactic's space service. Photo credit: NASA/Kim Shiflett

KENNEDY SPACE CENTER, FLA. -- At the Kennedy Space Center Shuttle Landing Facility, noted physicist Stephen Hawking, in the wheelchair, is ready to get onboard a modified Boeing 727 aircraft owned by Zero Gravity Corp. for his first zero-gravity flight. Zero Gravity Corp. is a commercial company licensed to provide the public with weightless flight experiences. At right is Peter Diamandis, founder of the Zero Gravity Corp. Behind Hawking is Nicola O'Brien, a nurse practitioner who is Hawking's aide. Hawking developed amyotrophic lateral sclerosis disease in the 1960s, a type of motor neuron disease which would cost him the loss of almost all neuromuscular control. At the celebration of his 65th birthday on January 8 this year, Hawking announced his plans for a zero-gravity flight to prepare for a sub-orbital space flight in 2009 on Virgin Galactic's space service. Photo credit: NASA/Kim Shiflett

KENNEDY SPACE CENTER, FLA. -- Noted physicist Stephen Hawking (center) returns to the Kennedy Space Center Shuttle Landing Facility after a zero gravity flight. At far left is Peter Diamandis, founder of the Zero Gravity Corp. that provided the flight aboard its modified Boeing 727. Hawking suffers from amyotrophic lateral sclerosis (also known as Lou Gehrig's disease). At the celebration of his 65th birthday on January 8 this year, Hawking announced his plans for a zero-gravity flight to prepare for a sub-orbital space flight in 2009 on Virgin Galactic's space service. Photo credit: NASA/Kim Shiflett

KENNEDY SPACE CENTER, FLA. -- At the Kennedy Space Center Shuttle Landing Facility, a modified Boeing 727 aircraft owned by Zero Gravity Corp. is ready to take off with its well-known passenger, physicist Stephen Hawking. Zero Gravity Corp. is a commercial company licensed to provide the public with weightless flight experiences. Hawking will be making his first zero-gravity flight. Hawking developed amyotrophic lateral sclerosis disease in the 1960s, a type of motor neuron disease which would cost him the loss of almost all neuromuscular control. At the celebration of his 65th birthday on January 8 this year, Hawking announced his plans for a zero-gravity flight to prepare for a sub-orbital space flight in 2009 on Virgin Galactic's space service. Photo credit: NASA/Kim Shiflett

KENNEDY SPACE CENTER, FLA. -- At the Kennedy Space Center Shuttle Landing Facility, noted physicist Stephen Hawking, in the wheelchair, arrives at the runway for his first zero-gravity flight. The flight will be aboard a modified Boeing 727 aircraft owned by Zero Gravity Corp., a commercial company licensed to provide the public with weightless flight experiences. At left is Peter Diamandis, founder of the Zero Gravity Corp. At center is Nicola O'Brien, a nurse practitioner who is Hawking's aide. Hawking developed amyotrophic lateral sclerosis disease in the 1960s, a type of motor neuron disease which would cost him the loss of almost all neuromuscular control. At the celebration of his 65th birthday on January 8 this year, Hawking announced his plans for a zero-gravity flight to prepare for a sub-orbital space flight in 2009 on Virgin Galactic's space service. Photo credit: NASA/Kim Shiflett

KENNEDY SPACE CENTER, FLA. — Noted physicist Stephen Hawking greets the media after his arrival at the Kennedy Space Center Shuttle Landing Facility for his first zero-gravity flight. The flight will be aboard a modified Boeing 727 aircraft owned by Zero Gravity Corp., a commercial company licensed to provide the public with weightless flight experiences. Hawking developed amyotrophic lateral sclerosis disease in the 1960s, a type of motor neuron disease which would cost him the loss of almost all neuromuscular control. At the celebration of his 65th birthday on January 8 this year, Hawking announced his plans for a zero-gravity flight to prepare for a sub-orbital space flight in 2009 on Virgin Galactic's space service. Photo credit: NASA/Kim Shiflett

KENNEDY SPACE CENTER, FLA. -- At the Kennedy Space Center Shuttle Landing Facility, a modified Boeing 727 aircraft owned by Zero Gravity Corp. takes off with its well-known passenger, physicist Stephen Hawking. Zero Gravity Corp. is a commercial company licensed to provide the public with weightless flight experiences. Hawking will be making his first zero-gravity flight. Hawking developed amyotrophic lateral sclerosis disease in the 1960s, a type of motor neuron disease which would cost him the loss of almost all neuromuscular control. At the celebration of his 65th birthday on January 8 this year, Hawking announced his plans for a zero-gravity flight to prepare for a sub-orbital space flight in 2009 on Virgin Galactic's space service. Photo credit: NASA/Jack Pfaller

KENNEDY SPACE CENTER, FLA. -- Noted physicist Stephen Hawking (center) returns to the Kennedy Space Center Shuttle Landing Facility after a zero gravity flight. At his side is Nicola O'Brien, a nurse practitioner who is Hawking's aide. At far left on the truck's tail gate is Peter Diamandis, founder of the Zero Gravity Corp. that provided the flight aboard its modified Boeing 727. Hawking suffers from amyotrophic lateral sclerosis (also known as Lou Gehrig's disease). At the celebration of his 65th birthday on January 8 this year, Hawking announced his plans for a zero-gravity flight to prepare for a sub-orbital space flight in 2009 on Virgin Galactic's space service. Photo credit: NASA/Kim Shiflett

KENNEDY SPACE CENTER, FLA. -- Well-wishers greet noted physicist Stephen Hawking (in the wheelchair) at the Kennedy Space Center Shuttle Landing Facility after a zero gravity flight. Next to him at left are Peter Diamandis, founder of the Zero Gravity Corp. that provided the flight aboard its modified Boeing 727, and Nicola O'Brien, a nurse practitioner who is Hawking's aide. Hawking suffers from amyotrophic lateral sclerosis (also known as Lou Gehrig's disease). At the celebration of his 65th birthday on January 8 this year, Hawking announced his plans for a zero-gravity flight to prepare for a sub-orbital space flight in 2009 on Virgin Galactic's space service. Photo credit: NASA/Kim Shiflett

KENNEDY SPACE CENTER, FLA. -- Noted physicist Stephen Hawking arrives at the Kennedy Space Center Shuttle Landing Facility for his first zero-gravity flight. The flight will be aboard a modified Boeing 727 aircraft owned by Zero Gravity Corp., a commercial company licensed to provide the public with weightless flight experiences. Hawking developed amyotrophic lateral sclerosis disease in the 1960s, a type of motor neuron disease which would cost him the loss of almost all neuromuscular control. At the celebration of his 65th birthday on January 8 this year, Hawking announced his plans for a zero-gravity flight to prepare for a sub-orbital space flight in 2009 on Virgin Galactic's space service. Photo credit: NASA/Kim Shiflett

KENNEDY SPACE CENTER, FLA. -- At the Kennedy Space Center Shuttle Landing Facility, Space Florida president Steve Kohler (left) talks to the media about physicist Stephen Hawking's (in the wheelchair) first zero-gravity flight. The flight will be aboard a modified Boeing 727 aircraft owned by Zero Gravity Corp., a commercial company licensed to provide the public with weightless flight experiences. At right is Peter Diamandis, founder of the Zero Gravity Corp. Hawking developed amyotrophic lateral sclerosis disease in the 1960s, a type of motor neuron disease which would cost him the loss of almost all neuromuscular control. At the celebration of his 65th birthday on January 8 this year, Hawking announced his plans for a zero-gravity flight to prepare for a sub-orbital space flight in 2009 on Virgin Galactic's space service. Photo credit: NASA/Kim Shiflett

KENNEDY SPACE CENTER, FLA. -- Well-wishers greet noted physicist Stephen Hawking (in the wheelchair) at the Kennedy Space Center Shuttle Landing Facility after a zero gravity flight. Next to him at left are Peter Diamandis, founder of the Zero Gravity Corp. that provided the flight aboard its modified Boeing 727, and Nicola O'Brien, a nurse practitioner who is Hawking's aide. Hawking suffers from amyotrophic lateral sclerosis (also known as Lou Gehrig's disease). At the celebration of his 65th birthday on January 8 this year, Hawking announced his plans for a zero-gravity flight to prepare for a sub-orbital space flight in 2009 on Virgin Galactic's space service. Photo credit: NASA/Kim Shiflett

KENNEDY SPACE CENTER, FLA. -- The media surround noted wheelchair-bound physicist Stephen Hawking after his arrival at the Kennedy Space Center Shuttle Landing Facility for his first zero-gravity flight. Behind Hawking, at left, is Space Florida president Steve Kohler. In the center, striding toward Hawking, is Zero Gravity Corp. founder Peter Diamandis. The flight will be aboard a modified Boeing 727 aircraft owned by Zero Gravity, a commercial company licensed to provide the public with weightless flight experiences. Hawking developed amyotrophic lateral sclerosis disease in the 1960s, a type of motor neuron disease which would cost him the loss of almost all neuromuscular control. At the celebration of his 65th birthday on January 8 this year, Hawking announced his plans for a zero-gravity flight to prepare for a sub-orbital space flight in 2009 on Virgin Galactic's space service. Photo credit: NASA/Kim Shiflett

KENNEDY SPACE CENTER, FLA. -- At the Kennedy Space Center Shuttle Landing Facility, Peter Diamandis, founder of the Zero Gravity Corp., talks to the media about physicist Stephen Hawking's (in the wheelchair) first zero-gravity flight. The flight will be aboard a modified Boeing 727 aircraft owned by Zero Gravity Corp., a commercial company licensed to provide the public with weightless flight experiences. Hawking developed amyotrophic lateral sclerosis disease in the 1960s, a type of motor neuron disease which would cost him the loss of almost all neuromuscular control. At the celebration of his 65th birthday on January 8 this year, Hawking announced his plans for a zero-gravity flight to prepare for a sub-orbital space flight in 2009 on Virgin Galactic's space service. Photo credit: NASA/Kim Shiflett

KENNEDY SPACE CENTER, FLA. -- At the Kennedy Space Center Shuttle Landing Facility, noted physicist Stephen Hawking, in the wheelchair, arrives at the runway for his first zero-gravity flight. The flight will be aboard a modified Boeing 727 aircraft owned by Zero Gravity Corp., a commercial company licensed to provide the public with weightless flight experiences. At left is Peter Diamandis, founder of the Zero Gravity Corp. Behind Hawking is Nicola O'Brien, a nurse practitioner who is Hawking's aide. Hawking developed amyotrophic lateral sclerosis disease in the 1960s, a type of motor neuron disease which would cost him the loss of almost all neuromuscular control. At the celebration of his 65th birthday on January 8 this year, Hawking announced his plans for a zero-gravity flight to prepare for a sub-orbital space flight in 2009 on Virgin Galactic's space service. Photo credit: NASA/Kim Shiflett

S85-44834 (20 Nov. 1985) --- This flying human chain represents prime and backup payload specialists for two upcoming STS missions. The group, representing trainees for STS-61C later this year and STS-51L early next year, shared some 40 parabolas in NASA?s KC-135, ?Zero-G? aircraft on Nov. 20, 1985. Left to right are Gerard Magilton, RCA backup payload specialist for STS-61C; Sharon Christa McAuliffe, payload specialist/teacher citizen observer for STS-51L; U.S. Representative Bill Nelson (D., Florida), scheduled for 61C; Barbara R. Morgan, backup to McAuliffe; and Robert J. Cenker, RCA payload specialist for 61C. The photo was taken by Otis Imboden. Photo credit: NASA

CANDLE FLAME NORMAL 1-G ONE GRAVITY AND MICROGRAVITY 0-G ZERO GRAVITY COMPARISON

Zero Gravity Locomotion Simulator (ZLS) (0-g)

Zero Gravity Locomotion Simulator (ZLS) (0-g)

KENNEDY SPACE CENTER, FLA. - The first group of passengers to fly on the ZERO-G aircraft are eager to get started. The Boeing 727-200 aircraft is used for weightless flights by Zero Gravity Corporation, known as ZERO-G, of Fort Lauderdale, Fla. NASA and ZERO-G demonstrated Nov. 5 the expanded access to and use of the space shuttle's runway and landing facility at Kennedy Space Center for non-NASA activities. The passengers, called "Flyers," were predominantly teachers who performed simple microgravity experiments they can share with their students back in the classroom.

KENNEDY SPACE CENTER, FLA. - The first group of passengers to fly on the ZERO-G aircraft line up. The Boeing 727-200 aircraft is used for weightless flights by Zero Gravity Corporation, known as ZERO-G, of Fort Lauderdale, Fla. NASA and ZERO-G demonstrated Nov. 5 the expanded access to and use of the space shuttle's runway and landing facility at Kennedy Space Center for non-NASA activities. The passengers, called "Flyers," were predominantly teachers who performed simple microgravity experiments they can share with their students back in the classroom.

KENNEDY SPACE CENTER, FLA. - The Boeing 727-200 aircraft used for weightless flights by Zero Gravity Corporation, known as ZERO-G, of Fort Lauderdale, Fla., lands after taking a group of passengers for demonstration. NASA and ZERO-G demonstrated Nov. 5 the expanded access to and use of the space shuttle's runway and landing facility at Kennedy Space Center for non-NASA activities. This group of passengers, called "Flyers," were predominantly teachers who performed simple microgravity experiments they can share with their students back in the classroom.

KENNEDY SPACE CENTER, FLA. - The Boeing 727-200 aircraft used for weightless flights by Zero Gravity Corporation, known as ZERO-G, of Fort Lauderdale, Fla., lands after taking a group of passengers for demonstration. NASA and ZERO-G demonstrated Nov. 5 the expanded access to and use of the space shuttle's runway and landing facility at Kennedy Space Center for non-NASA activities. This group of passengers, called "Flyers," were predominantly teachers who performed simple microgravity experiments they can share with their students back in the classroom.

KENNEDY SPACE CENTER, FLA. - A view inside the Boeing 727-200 aircraft used for weightless flights by Zero Gravity Corporation, known as ZERO-G, of Fort Lauderdale, Fla. NASA and ZERO-G demonstrated Nov. 5 the expanded access to and use of the space shuttle's runway and landing facility at Kennedy Space Center for non-NASA activities. A group of passengers, called "Flyers," were predominantly teachers who performed simple microgravity experiments they can share with their students back in the classroom.

KENNEDY SPACE CENTER, FLA. - The Boeing 727-200 aircraft used for weightless flights by Zero Gravity Corporation, known as ZERO-G, of Fort Lauderdale, Fla., waits for its passengers. NASA and ZERO-G demonstrated Nov. 5 the expanded access to and use of the space shuttle's runway and landing facility at Kennedy Space Center for non-NASA activities. A group of passengers, called "Flyers," were predominantly teachers who performed simple microgravity experiments they can share with their students back in the classroom.

Astronaut -Candidate (ASCAN) Guion S. Bluford and Aviation Safety Officer Charles F. Hayes got a unique perspective of their environment during a zero- gravity flight. They are aboard a KC-135 Aircraft, which flies a special pattern repeatedly to afford a series of 30-seconds-of-weightlessness sessions. Astronauts Bluford and Hayes are being assisted by C. P. Stanley of the Photography Branch of the Photographic Technology Division (PTD) at Johnson Space Center (JSC). Some medical studies and a Motion Sickness Experiment were conducted on this particular flight. Astronaut Bluford is one of 20 Scientist/ASCAN's who began training at JSC, 07/1978. 1. Dr. Jeffrey A. Hoffman - Zero-G 2. ASCAN Shannon Lucid - Zero-G 3. ASCAN Guion Bluford - Zero-G

KENNEDY SPACE CENTER, FLA. - The Boeing 727-200 aircraft used for weightless flights by Zero Gravity Corporation, known as ZERO-G, of Fort Lauderdale, Fla., is airborne from Kennedy Space Center’s shuttle landing facility. NASA and ZERO-G demonstrated Nov. 5 the expanded access to and use of the space shuttle's runway and landing facility at Kennedy Space Center for non-NASA activities. The group of passengers, called "Flyers," were predominantly teachers who performed simple microgravity experiments they can share with their students back in the classroom.

KENNEDY SPACE CENTER, FLA. - The Boeing 727-200 aircraft used for weightless flights by Zero Gravity Corporation, known as ZERO-G, of Fort Lauderdale, Fla., takes off from Kennedy Space Center’s shuttle landing facility. NASA and ZERO-G demonstrated Nov. 5 the expanded access to and use of the space shuttle's runway and landing facility at Kennedy Space Center for non-NASA activities. The group of passengers, called "Flyers," were predominantly teachers who performed simple microgravity experiments they can share with their students back in the classroom.

KENNEDY SPACE CENTER, FLA. - Passengers known as “Flyers” disembark at Kennedy Space Center’s shuttle landing facility from a Boeing 727-200 aircraft used for weightless flights by Zero Gravity Corporation, known as ZERO-G, of Fort Lauderdale, Fla. NASA and ZERO-G demonstrated Nov. 5 the expanded access to and use of the space shuttle's runway and landing facility at Kennedy Space Center for non-NASA activities. The “Flyers” were predominantly teachers who performed simple microgravity experiments they can share with their students back in the classroom.

NIKI WERKHEISER - 3D PRINTING ZERO-G PROJECT MANAGER, DISCUSSES 3D PRINTING TECHNOLOGY WITH DR. ELLEN OCHOA.1401414 THE ISS NOW HAS A 3D PRINTER, WHICH THE TECHNOLOGY WAS TESTED AT THE MARSHALL SPACE FLIGHT CENTER

SL4-150-5074 (February 1974) --- Scientist-astronaut Edward G. Gibson, science pilot for the Skylab 4 mission, demonstrates the effects of zero-gravity as he sails through airlock module hatch. Photo credit: NASA

NIKI WERKHEISER, NASA'S 3D PRINTING IN ZERO-G PROJECT MANAGER, HOLDS A 3D PRINTED CUBESAT STRUCTURE WHICH IS JUST ONE OF THE MANY POTENTIAL APPLICATIONS THAT AN IN-SPACE MANUFACTURING CAPABILITY WILL PROVIDE

Comparison of a Candle Flame burning in normal gravity or 1-G (left) and a flame burning in Microgravity.

High Pressure Microgravity Combustion Experiment, HPMC, subjects liquid fuel droplets to high pressures and temperatures to study the ignition process in engine conditions, with a goal of improving fuel efficiency. In this configuration, the experiment is capable of testing droplet combustion at up to 100 atm of pressure, testing the droplet deployment system, which inserts the fuel droplet into the experiment.

ISS009-E-10551 (4 June 2004) --- Astronaut Edward M. (Mike) Fincke, Expedition 9 NASA ISS science officer and flight engineer, moves the Zero-G Storage Rack (ZSR) in the Destiny laboratory of the International Space Station (ISS) in order to retrieve the spare Remote Power Controller Module (RPCM), scheduled to replace the failed RPCM on the S0 (S-Zero) Truss. Fincke is positioned above the ZSR, which has been pulled from the Express Rack.

S79-30347 (31 March 1979) --- Taking advantage of a brief period of zero-gravity afforded aboard a KC-135 flying a parabolic curve, the flight crew of the first space shuttle orbital flight test (STS-1) goes through a spacesuit donning exercise. Astronaut John W. Young has just entered the hard-material torso of the shuttle spacesuit by approaching it from below. He is assisted by astronaut Robert L. Crippen. The torso is held in place by a special stand here, simulating the function provided by the airlock wall aboard the actual shuttle craft. The life support system is mated to the torso on Earth and remains so during the flight, requiring this type of donning and doffing exercise. Note Crippen?s suit is the type to be used for intravehicular activity in the shirt sleeve environment to be afforded aboard shuttle. The suit worn by Young is for extravehicular activity (EVA). Young will be STS-1 commander and Crippen, pilot. They will man the space shuttle orbiter 102 Columbia. Photo credit: NASA

The payload bay doors of the Space Shuttle Orbiter Columbia were opened for the first time today using the orbiter's onboard door operation system. The hinges of the payload bay doors are not designed to support the weight of the doors while open horizontally in the Earth's one 'g' environment and a counterweight zero 'g' device supports the weight of the doors while they are open for processing in the OPF.

The payload bay doors of the Space Shuttle Orbiter Columbia were opened for the first time today using the orbiter's onboard door operation system. The hinges of the payload bay doors are not designed to support the weight of the doors while open horizontally in the Earth's one 'g' environment and a counterweight zero 'g' device supports the weight of the doors while they are open for processing in the OPF.

ISS008-E-05865 (12 November 2003) --- Cosmonaut Alexander Y. Kaleri, Expedition 8 flight engineer, moves a Zero-G Storage Rack (ZSR) in the Destiny laboratory on the International Space Station (ISS). Kaleri, who represents Rosaviakosmos, commanded the Soyuz flight that took the crew to the station last month.

S94-35542 (June 1994) --- Astronaut Catherine G. Coleman, mission specialist, gets a preview of next year?s United States Microgravity Laboratory (USML-2) mission aboard the Space Shuttle Columbia. The weightless experience was afforded by a special parabolic pattern flown by NASA?s KC-135 ?zero gravity? aircraft.

ISS017-E-018973 (9 Oct. 2008) --- Russian Federal Space Agency cosmonaut Sergei Volkov, Expedition 17 commander, works in the Kibo laboratory to move a zero-g stowage rack (ZSR) during a relocation task. The ZSR was previously in the Destiny laboratory of the International Space Station.

ISS008-E-05854 (12 November 2003) --- Cosmonaut Alexander Y. Kaleri, Expedition 8 flight engineer, moves a Zero-G Storage Rack (ZSR) in the Destiny laboratory on the International Space Station (ISS). Kaleri, who represents Rosaviakosmos, commanded the Soyuz flight that took the crew to the station last month.

ISS008-E-05856 (12 November 2003) --- Cosmonaut Alexander Y. Kaleri, Expedition 8 flight engineer, moves a Zero-G Storage Rack (ZSR) in the Destiny laboratory on the International Space Station (ISS). Kaleri, who represents Rosaviakosmos, commanded the Soyuz flight that took the crew to the station last month.

ISS017-E-018977 (9 Oct. 2008) --- NASA astronaut Greg Chamitoff, Expedition 17 flight engineer, works in the Kibo laboratory to move a zero-g stowage rack (ZSR) during a relocation task. The ZSR was previously in the Destiny laboratory of the International Space Station.

jsc2024e036956 (3/9/2023) --- The Multi-use Variable-g Platform (MVP) Cell Experiment Module is shown. Twelve of these modules run with each housing three sample conditions for the Maturation of Vascularized Liver Tissue Construct in Zero Gravity (MVP Cell-07) investigation. Image courtesy of Grant Vellinger, Redwire.

Paul Scully-Power, 41-G payload specialist, links arms with two others as they experience weightlessness in the KC-135 training aircraft. The trio appears to be flying toward the front of the aircraft while others take photos.

S85-42474 (16 Oct. 1985) --- A KC-135 aircraft provides a brief period of weightlessness as a preview for a teacher, in training to fly onboard a space shuttle for the Teacher-in-Space Project, and her backup. Sharon Christa McAuliffe (center frame), STS-51L prime crew member, and Barbara Morgan, her backup, monitor an experiment involving magnetic effects - one of the tests to be performed on the STS-51L flight. The experiment uses a control box, a square receptacle containing rubber tubing, stainless steel rod, a filter with desiccant, soft iron wire and a magnet. Photo credit: NASA

View of astronaut candidates and payload specialists during a training flight on the KC-135. The trainees are experiencing weightlessness in the hold of the aircraft.

At the Baikonur Cosmodrome in Kazakhstan, Expedition 57 crewmembers Nick Hague of NASA (left) and Alexey Ovchinin of Roscosmos (right) hold up toy mascots Oct. 6 during final fit check activities prior to launch. The mascots will be mounted over their heads in the Soyuz MS-10 spacecraft to serve as “zero-G” indicators when they launch Oct. 11 for a six-month mission on the International Space Station...NASA/Victor Zelentsov.

51F-13-021 (29 July-6 Aug 1985) --- Astronaut Story Musgrave, STS51F mission specialist, is seen hitching a zero-g ride on a blood centrifuge on the middeck of the space shuttle Challenger. "The centrifuge got more workout than just separation of our blood," crewmate John Bartoe, payload specialist, later told a gathering of media representatives at the 51F post-flight press conference, referring to Musgrave's off-duty antics. Photo credit: NASA

The Reduced-Gravity Program provides the unique weightless or zero-g environment of space flight for testing and training of human and hardware reactions. The reduced-gravity environment is obtained with a specially modified KC-135A turbojet transport which flies parabolic arcs to produce weightless periods of 20 to 25 seconds. KC-135A cargo bay test area is approximately 60 feet long, 10 feet wide, and 7 feet high. The image shows KC-135A in flight.

Group photo representating past and present Multi-Media Services (MMS) photographer and videographers that have supported Zero-G Reduced Gravity Office operations throughout the year prior to the programs final flight on August 29, 2014. Photo Date: August 18, 2014. Location: Ellington Field - Hangar 990. Photographer: Robert Markowitz

S86-25192 (January 1986) --- Two payload specialists in training for the STS-51L mission, and a payload specialist from STS-61C share a ?zero-gravity? flight aboard a KC-135 aircraft over the Gulf of Mexico. Left to right are United States Representative Bill Nelson (Democrat, Florida), Sharon Christa McAuliffe, and Barbara R. Morgan. The congressman is a payload specialist for the STS-61C mission. McAuliffe is the prime payload specialist for the Teacher-in-Space Project aboard the STS-51L mission; and Morgan is her backup. The photo was taken by Keith meyers of the New York Times. EDITOR?S NOTE: The STS-51L crew members lost their lives in the space shuttle Challenger accident moments after launch on Jan. 28, 1986 from the Kennedy Space Center (KSC). Photo credit: NASA

S86-25191 (for release January 1986) --- The two representatives of the Teacher-in-Space Project continue their training program at the Johnson Space Center with an additional flight aboard NASA?s KC-135 ?zero gravity? aircraft. Sharon Christa McAuliffe, left, is prime crew payload specialist, and Barbara R. Morgan is in training as backup payload specialist. The photo was taken by Keith Meyers of New York Times. Photo credit: NASA

S82-33603 (November 1982) --- Astronaut F. Story Musgrave, STS-6 mission specialist, is assisted in a suit donning and doffing exercise in the weightlessness provided by a KC-135 ?zero-gravity? aircraft. Dr. Musgrave and the next mission?s other mission specialist, astronaut Donald H. Peterson, participated in the donning and doffing as a simulation for their preparations aboard the Challenger when they are called upon to perform an extravehicular activity (EVA) which was postponed from NASA?s first operational STS flight earlier this month. The suit is called an Extravehicular Mobility Unit (EMU). Photo credit: NASA

S86-25196 (January 1986) --- Sharon Christa McAuliffe, STS-51L citizen observer/payload specialist, gets a preview of microgravity during a special flight aboard NASA?s KC-135 ?zero gravity? aircraft. McAuliffe will represent the Teacher-in-Space Project aboard the space shuttle Challenger when it launches later this month. This photograph was taken by Keith Meyers of the New York Times. EDITOR?S NOTE: The STS-51L crew members lost their lives in the space shuttle Challenger accident moments after launch on Jan. 28, 1986 from the Kennedy Space Center (KSC). Photo credit: NASA

S84-37532 (18 July 1984) --? Robert B. Thirsk, backup payload specialist for 41-G appears to be shaking hands with an unoccupied extravehicular mobility unit (EMU) during a familiarization flight aboard NASA?s KC-135 aircraft. Thirsk, representing Canada?s National Research Council (NRC), serves as backup to Marc Garneau on the seven-member crew for Challenger?s October 1984 flight. This aircraft is used extensively for training and exposing Shuttle crewmembers to weightlessness as well as for evaluation of equipment and experiments scheduled for future flights.

S86-25180 (October 1985) --- Sharon Christa McAuliffe, STS-51L citizen observer/payload specialist, representing the Teacher-in-Space Project, floats forward and upward during a few moments of weightlessness aboard a KC-135 aircraft. The flight is part of her training for the scheduled five-day flight aboard the Challenger in January of next year. Barbara R. Morgan, backup payload specialist for STS-51L, is partially visible in the background. The photo was taken by Keith Meyers of the New York Times. Photo credit: NASA

STS98-E-5250 (15 February 2001) --- Astronaut Kenneth D. Cockrell (left), STS-98 mission commander, teams with cosmonaut Sergei K. Krikalev, Expedition One flight engineer in setting up hardware aboard the newly opened Destiny laboratory onboard the International Space Station (ISS). This photo was recorded with a digital still camera.

S84-37522 (18 July 1984) --- Astronaut Jon A. McBride, center, floats briefly aboard a NASA KC-135 aircraft during a flight designed as part of the training program for 41-G's seven crewmembers. McBride is pilot for that October 1984 flight. Marc Garneau, one of two payload specialists for the mission, is seated at right. Garneau represents the National Research Council of Canada.

S73-32113 (9 Aug. 1973) --- Scientist-astronaut Owen K. Garriott, Skylab 3 science pilot, serves as test subject for the Skylab ?Human Vestibular Function? M131 Experiment, as seen in this photographic reproduction taken from a television transmission made by a color TV camera aboard the Skylab space station in Earth orbit. The objectives of the Skylab M131 experiment are to obtain data pertinent to establishing the validity of measurements of specific behavioral/physiological responses influenced by vestibular activity under one-g and zero-g conditions; to determine man?s adaptability to unusual vestibular conditions and predict habitability of future spacecraft conditions involving reduced gravity and Coriollis forces; and to measure the accuracy and variability in man?s judgment of spatial coordinates based on atypical gravity receptor cues and inadequate visual cues. Photo credit: NASA

jsc2017e096664 (July 17, 2017) --- In the Integration Facility at the Baikonur Cosmodrome in Kazakhstan, unidentified Expedition 52-53 crewmembers display toys from their children July 17 outside their Soyuz MS-05 spacecraft during a fit check dress rehearsal. The toys are hung above the crewmembers’ heads in the Soyuz’ descent module compartment as weightless, or “zero-g” indicators during the launch phase of the mission. Randy Bresnik of NASA, Sergey Ryazanskiy of the Russian Federal Space Agency (Roscosmos) and Paolo Nespoli of the European Space Agency will launch July 28 on the Soyuz MS-05 spacecraft for a five-month mission on the International Space Station. Credit: Andrey Shelepin/Gagarin Cosmonaut Training Center

At the Baikonur Cosmodrome in Kazakhstan, Expedition 34/35 Soyuz Commander Roman Romanenko (center) holds a toy “talisman” that his 9-year old daughter, Anastasia, gave him to hang over his seat in the Soyuz TMA-07M spacecraft as a zero-G indicator during launch with his crewmates, Flight Engineer Tom Marshburn of NASA (left) and Flight Engineer Chris Hadfield of the Canadian Space Agency (right). The toy, named “Klyopa” for the Egyptian queen Cleopatra, was unveiled during a “fit check” dress rehearsal Dec. 7, 2012 in Baikonur leading to the crew’s launch Dec. 19 for a five-month mission on the International Space Station. Photo Credit: NASA/Victor Zelentsov

0687: At the Gagarin Cosmonaut Training Center in Star City, Russia, Expedition 40/41 Soyuz Commander Max Suraev of the Russian Federal Space Agency (Roscosmos, center) plays with a toy giraffe at the crew’s pre-launch news conference May 8 while his crewmates, Alexander Gerst of the European Space Agency (left) and Reid Wiseman of NASA (right) look on. The giraffe, which belongs to Wiseman’s daughter, will fly as a “zero-G” mascot above the heads of the crew in the Soyuz TMA-13M spacecraft when they launch May 29, Kazakh time, from the Baikonur Cosmodrome in Kazakhstan for a 5 ½ month mission on the International Space Station. NASA/Stephanie Stoll

NASA astronaut Mike Hopkins shows his crew’s “zero-G indicator” as he speaks with students about his time aboard the International Space Station during the Crew-1 mission, Thursday, Nov. 18, 2021, at Garfield Elementary School in Washington, DC. Hopkins and fellow NASA astronauts Shannon Walker, Victor Glover, and Japan Aerospace Exploration Agency (JAXA) astronaut Soichi Noguchi launched on the first crew rotation mission to the International Space Station for SpaceX’s Falcon 9 and Crew Dragon spacecraft as part of the agency’s Commercial Crew Program and spent 168 days in space across Expeditions 64 and 65. Photo Credit: (NASA/Joel Kowsky)

0704: At the Gagarin Cosmonaut Training Center in Star City, Russia, Expedition 40/41 Flight Engineer Reid Wiseman of NASA listens to a reporter’s question May 8 during a pre-launch news conference. Near him is a toy giraffe belonging to his daughter that will fly as a “zero-G” mascot above the heads of the crew in the Soyuz TMA-13M spacecraft when Wiseman, Flight Engineer Alexander Gerst of the European Space Agency and Soyuz Commander Max Suraev of the Russian Federal Space Agency (Roscosmos) launch May 29, Kazakh time, from the Baikonur Cosmodrome in Kazakhstan for a 5 ½ month mission on the International Space Station. NASA/Stephanie Stoll

S73-37650 (28 Nov. 1973) --- Astronaut Gerald P. Carr, right, Skylab 4 commander, enjoys a meal aboard the orbiting Skylab space station in this photographic reproduction from a television of Nov. 28, 1973. Scientist-astronaut Edward G. Gibson, science pilot for the third manned Skylab flight, demonstrates the zero-gravity environment by turning upside. The two crewmen were joined by astronaut William R. Pogue, pilot, for the evening meal. The food station is in the wardroom of the Crew Quarters in the Orbital Workshop (OWS). Photo credit: NASA

ISS035-E-017874 (8 April 2013) --- NASA astronaut Chris Cassidy, Expedition 35 flight engineer, performs Body Mass Measurement activities using the Space Linear Acceleration Mass Measurement Device (SLAMMD) in the Columbus European Laboratory aboard the Earth-orbiting International Space Station. Since crew members can?t weigh themselves in zero-g, they use this method as the next best thing. Skylab astronauts, the first NASA crew members to fly in space for over a month at a time, some 40 years ago, used a body mass measurement device that was somewhat different from this.

S94-26350 (10 Jan. 1994) --- Astronaut Catherine G. Coleman seems to enjoy the brief period of weightlessness she is sharing with fellow members of the 1992 class of astronauts. The weightless experience was afforded by a special parabolic pattern flown by NASA?s KC-135 ?zero gravity? aircraft. Left to right behind her are astronauts Michael E. Lopez-Alegria, Kevin R. Kregel and Winston E. Scott. EDITOR?S NOTE: Since this photograph was taken the four have been named to flights as follows: Kregel, STS-70; Scott, STS-72.

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W. Brian Dunlap of Youngstown, Ohio, proposed Skylab student experiment ED-78, Liquid Motion in Zero-G, a study of wave motion in a liquid. He was particularly interested in comparing surface waves over a liquid in zero-gravity with those occurring on Earth. In space, with the absence of gravity, a liquid does not necessarily take the shape of its container as it does on Earth. Adhesion forces may hold the liquid in contact with its container, but the liquid can also assume a free-floating condition. It was in this latter state that Dunlap wished to examine the behavior of surface waves. Data were recorded on videotape and subsequently converted to 16-mm film. Dunlap analyzed these data to determine periods of oscillation of free-floating globules and found agreement with the theory to be much better than expected. In March 1972, NASA and the National Science Teachers Association selected 25 experiment proposals for flight on Skylab. Science advisors from the Marshall Space Flight Center aided and assisted the students in developing the proposals for flight on Skylab.

S73-34171 (9 Aug. 1973) --- Scientist-astronaut Owen K. Garriott, Skylab 3 science pilot, serves as test subject for the Skylab ?Human Vestibular Function? M131 Experiment, as seen in this photographic reproduction taken from a television transmission made by a color TV camera aboard the Skylab space station in Earth orbit. The objectives of the Skylab M131 experiment are to obtain data pertinent to establishing the validity of measurements of specific behavioral/physiological responses influenced by vestibular activity under one-g and zero-g conditions; to determine man?s adaptability to unusual vestibular conditions and predict habitability of future spacecraft conditions involving reduced gravity and Coriollis forces; and to measure the accuracy and variability in man?s judgment of spatial coordinates based on atypical gravity receptor cues and inadequate visual cures. Dr. Garriott is seated in the experiment?s litter chair which can rotate the test subject at predetermined rotational velocity or programmed acceleration/decelerational profile. Photo credit: NASA

CAPE CANAVERAL, Fla. - In the Space Station Processing Facility at NASA's Kennedy Space Center in Florida, technicians install the zero-g storage rack into Multi-Purpose Logistics Module Leonardo. The seven-member STS-131 crew will deliver Leonardo, filled with resupply stowage platforms and racks, to the International Space Station aboard space shuttle Discovery. Work to attach a spare ammonia tank assembly to the station's exterior and return a European experiment from outside the station's Columbus module will be conducted during three spacewalks. STS-131, targeted for launch on April 5, will be the 33rd shuttle mission to the station and the 131st shuttle mission overall. For information on the STS-131 mission and crew, visit http:__www.nasa.gov_mission_pages_shuttle_shuttlemissions_sts131_index.html. Photo credit: NASA_Jim Grossmann

Applied Physics Laboratory engineers and technicians from Johns Hopkins University test solar array deployment of the Advanced Composition Explorer (ACE) in KSC’s Spacecraft Assembly and Encapsulation Facility-II (SAEF-II). The wire hanging from the ceiling above the black solar array panel is used for "g-negation," which takes the weight off of the panel’s hinges to simulate zero gravity, mimicking deployment in space. Scheduled for launch on a Delta II rocket from Cape Canaveral Air Station on Aug. 25, ACE will study low-energy particles of solar origin and high-energy galactic particles for a better understanding of the formation and evolution of the solar system as well as the astrophysical processes involved. The collecting power of instrumentation aboard ACE is at least 100 times more sensitive than anything previously flown to collect similar data by NASA

At the Baikonur Cosmodrome in Kazakhstan, the Expedition 33/34 crew posed for pictures October 10, 2012 in front of their Soyuz TMA-06M spacecraft during the first of two “fit check” dress rehearsal sessions. NASA Flight Engineer Kevin Ford (left), Soyuz Commander Oleg Novitskiy (center) and Flight Engineer Evgeny Tarelkin (right) are in the final phase of their training for launch October 23 for a five-month mission on the International Space Station. Novitskiy is holding a toy hippopotamus that will serve as a “zero-g” indicator over his head while he is strapped into the center seat of the descent module section of the Soyuz during its nine minute climb from the launch pad to orbit. NASA/Victor Zelentsov