CAPE CANAVERAL, Fla. -- A wreath is displayed at the foot of the Space Mirror Memorial at the Kennedy Space Center Visitor Complex in Florida during a ceremony to honor space shuttle Challenger's STS-51L crew members who gave their lives for while furthering the cause of exploration and discovery. 2011 marks the 25th anniversary of the loss of Challenger, which broke apart over the Atlantic Ocean 73 seconds into flight on Jan. 28, 1986. NASA/Jack Pfaller

CAPE CANAVERAL, Fla. -- Dr. June Scobee Rodgers, the founding chair of the Challenger Center for Space Science Education, honors her late-husband, space shuttle Challenger's STS-51L Commander Dick Scobee, who gave his life while furthering the cause of exploration and discovery. She and others gathered at the foot of the Space Mirror Memorial at the Kennedy Space Center Visitor Complex in Florida to honor Scobee and his crewmates. 2011 marks the 25th anniversary of the loss of Challenger, which broke apart over the Atlantic Ocean 73 seconds into flight on Jan. 28, 1986. Photo credit: NASA/Kim Shiflett

CAPE CANAVERAL, Fla. -- Stephen Feldman, president of The Astronauts Memorial Foundation, left; Dr. June Scobee Rodgers, founding chair of the Challenger Center for Space Science Education and widow of space shuttle Challenger's STS-51L Commander Dick Scobee; Michael McCulley, former astronaut and chairman of The Astronauts Memorial Foundation; Bob Cabana, former astronaut and NASA Kennedy Space Center director; Rick Soria, 2009 Alan Shepard Technology in Education Award winner, and William Gerstenmaier, NASA Associate Administrator for Space Operations gather in front of the Space Mirror Memorial at the Kennedy Space Center Visitor Complex in Florida to honor the Challenger crew members who gave their lives for while furthering the cause of exploration and discovery. 2011 marks the 25th anniversary of the loss of Challenger, which broke apart over the Atlantic Ocean 73 seconds into flight on Jan. 28, 1986. Photo credit: NASA/Kim Shiflett

CAPE CANAVERAL, Fla. -- Michael McCulley, former astronaut and chairman of the Astronauts Memorial Foundation, speaks to a crowd gathered in front of the Space Mirror Memorial at the Kennedy Space Center Visitor Complex in Florida to honor space shuttle Challenger's STS-51L crew members who gave their lives for while furthering the cause of exploration and discovery. 2011 marks the 25th anniversary of the loss of Challenger, which broke apart over the Atlantic Ocean 73 seconds into flight on Jan. 28, 1986. NASA/Jack Pfaller

CAPE CANAVERAL, Fla. -- A crowd gathers in front of the Space Mirror Memorial at the Kennedy Space Center Visitor Complex in Florida to honor space shuttle Challenger's STS-51L crew members who gave their lives for while furthering the cause of exploration and discovery. 2011 marks the 25th anniversary of the loss of Challenger, which broke apart over the Atlantic Ocean 73 seconds into flight on Jan. 28, 1986. NASA/Jack Pfaller

CAPE CANAVERAL, Fla. -- Dr. June Scobee Rodgers, the founding chair of the Challenger Center for Space Science Education and widow of space shuttle Challenger's STS-51L Commander Dick Scobee, speaks to a crowd gathered in front of the Space Mirror Memorial at the Kennedy Space Center Visitor Complex in Florida to honor the Challenger crew members who gave their lives for while furthering the cause of exploration and discovery. 2011 marks the 25th anniversary of the loss of Challenger, which broke apart over the Atlantic Ocean 73 seconds into flight on Jan. 28, 1986. NASA/Jack Pfaller

CAPE CANAVERAL, Fla. -- Dr. June Scobee Rodgers, the founding chair of the Challenger Center for Space Science Education and widow of space shuttle Challenger's STS-51L Commander Dick Scobee, speaks to a crowd gathered in front of the Space Mirror Memorial at the Kennedy Space Center Visitor Complex in Florida to honor the Challenger crew members who gave their lives for while furthering the cause of exploration and discovery. 2011 marks the 25th anniversary of the loss of Challenger, which broke apart over the Atlantic Ocean 73 seconds into flight on Jan. 28, 1986. Photo credit: NASA/Kim Shiflett

CAPE CANAVERAL, Fla. -- A wreath is displayed at the foot of the Space Mirror Memorial at the Kennedy Space Center Visitor Complex in Florida during a ceremony to honor space shuttle Challenger's STS-51L crew members who gave their lives for while furthering the cause of exploration and discovery. 2011 marks the 25th anniversary of the loss of Challenger, which broke apart over the Atlantic Ocean 73 seconds into flight on Jan. 28, 1986. Photo credit: NASA/Kim Shiflett

CAPE CANAVERAL, Fla. -- A crowd lays roses and pays their respects space shuttle Challenger's STS-51L crew members who gave their lives for while furthering the cause of exploration and discovery. They gathered for a memorial ceremony in front of the Space Mirror Memorial at the Kennedy Space Center Visitor Complex in Florida. 2011 marks the 25th anniversary of the loss of Challenger, which broke apart over the Atlantic Ocean 73 seconds into flight on Jan. 28, 1986. Photo credit: NASA/Kim Shiflett

CAPE CANAVERAL, Fla. -- Dr. June Scobee Rodgers, the founding chair of the Challenger Center for Space Science Education and widow of space shuttle Challenger's STS-51L Commander Dick Scobee, left, and NASA Associate Administrator for Space Operations William Gerstenmaier pay their respects to the space shuttle Challenger crew members who gave their lives for while furthering the cause of exploration and discovery at the foot of the Space Mirror Memorial at the Kennedy Space Center Visitor Complex in Florida. 2011 marks the 25th anniversary of the loss of Challenger, which broke apart over the Atlantic Ocean 73 seconds into flight on Jan. 28, 1986. Photo credit: NASA/Kim Shiflett

CAPE CANAVERAL, Fla. -- Former astronaut and NASA Kennedy Space Center Director Bob Cabana speaks to a crowd gathered in front of the Space Mirror Memorial at the Kennedy Space Center Visitor Complex in Florida to honor space shuttle Challenger's STS-51L crew members who gave their lives for while furthering the cause of exploration and discovery. 2011 marks the 25th anniversary of the loss of Challenger, which broke apart over the Atlantic Ocean 73 seconds into flight on Jan. 28, 1986. Photo credit: NASA/Kim Shiflett

CAPE CANAVERAL, Fla. -- A crowd gathers in front of the Space Mirror Memorial at the Kennedy Space Center Visitor Complex in Florida to honor space shuttle Challenger's STS-51L crew members who gave their lives for while furthering the cause of exploration and discovery. 2011 marks the 25th anniversary of the loss of Challenger, which broke apart over the Atlantic Ocean 73 seconds into flight on Jan. 28, 1986. NASA/Jack Pfaller

CAPE CANAVERAL, Fla. -- Dr. June Scobee Rodgers, the founding chair of the Challenger Center for Space Science Education and widow of space shuttle Challenger's STS-51L Commander Dick Scobee, and NASA Associate Administrator for Space Operations William Gerstenmaier pay their respects to the space shuttle Challenger crew members who gave their lives for while furthering the cause of exploration and discovery at the foot of the Space Mirror Memorial at the Kennedy Space Center Visitor Complex in Florida. 2011 marks the 25th anniversary of the loss of Challenger, which broke apart over the Atlantic Ocean 73 seconds into flight on Jan. 28, 1986. NASA/Jack Pfaller

CAPE CANAVERAL, Fla. -- NASA Associate Administrator for Space Operations William Gerstenmaier speaks to a crowd gathered in front of the Space Mirror Memorial at the Kennedy Space Center Visitor Complex in Florida to honor space shuttle Challenger's STS-51L crew members who gave their lives for while furthering the cause of exploration and discovery. 2011 marks the 25th anniversary of the loss of Challenger, which broke apart over the Atlantic Ocean 73 seconds into flight on Jan. 28, 1986. Photo credit: NASA/Kim Shiflett

CAPE CANAVERAL, Fla. -- Rick Soria, the 2009 Alan Shepard Technology in Education Award winner, speaks to a crowd gathered in front of the Space Mirror Memorial at the Kennedy Space Center Visitor Complex in Florida to honor space shuttle Challenger's STS-51L crew members who gave their lives for while furthering the cause of exploration and discovery. 2011 marks the 25th anniversary of the loss of Challenger, which broke apart over the Atlantic Ocean 73 seconds into flight on Jan. 28, 1986. Photo credit: NASA/Kim Shiflett

CAPE CANAVERAL, Fla. -- Former astronaut and Chairman of The Astronauts Memorial Foundation Michael McCulley speaks to a crowd gathered in front of the Space Mirror Memorial at the Kennedy Space Center Visitor Complex in Florida to honor space shuttle Challenger's STS-51L crew members who gave their lives for while furthering the cause of exploration and discovery. 2011 marks the 25th anniversary of the loss of Challenger, which broke apart over the Atlantic Ocean 73 seconds into flight on Jan. 28, 1986. Photo credit: NASA/Kim Shiflett

CAPE CANAVERAL, Fla. -- NASA Associate Administrator for Space Operations William Gerstenmaier speaks to a crowd gathered in front of the Space Mirror Memorial at the Kennedy Space Center Visitor Complex in Florida to honor space shuttle Challenger's STS-51L crew members who gave their lives for while furthering the cause of exploration and discovery. 2011 marks the 25th anniversary of the loss of Challenger, which broke apart over the Atlantic Ocean 73 seconds into flight on Jan. 28, 1986. Photo credit: NASA/Kim Shiflett

CAPE CANAVERAL, Fla. -- Former astronaut and NASA Kennedy Space Center Director Bob Cabana speaks to a crowd gathered in front of the Space Mirror Memorial at the Kennedy Space Center Visitor Complex in Florida to honor space shuttle Challenger's STS-51L crew members who gave their lives for while furthering the cause of exploration and discovery. 2011 marks the 25th anniversary of the loss of Challenger, which broke apart over the Atlantic Ocean 73 seconds into flight on Jan. 28, 1986. Photo credit: NASA/Kim Shiflett

CAPE CANAVERAL, Fla. -- Stephen Feldman, president of the Astronauts Memorial Foundation, speaks to a crowd gathered in front of the Space Mirror Memorial at the Kennedy Space Center Visitor Complex in Florida to honor space shuttle Challenger's STS-51L crew members who gave their lives for while furthering the cause of exploration and discovery. 2011 marks the 25th anniversary of the loss of Challenger, which broke apart over the Atlantic Ocean 73 seconds into flight on Jan. 28, 1986. NASA/Jack Pfaller

CAPE CANAVERAL, Fla. -- Mick Ukleja, from The Astronauts Memorial Foundation, provides the invocation in front of the Space Mirror Memorial at the Kennedy Space Center Visitor Complex in Florida to honor space shuttle Challenger's STS-51L crew members who gave their lives for while furthering the cause of exploration and discovery. 2011 marks the 25th anniversary of the loss of Challenger, which broke apart over the Atlantic Ocean 73 seconds into flight on Jan. 28, 1986. Photo credit: NASA/Kim Shiflett

CAPE CANAVERAL, Fla. -- A crowd gathers in front of the Space Mirror Memorial at the Kennedy Space Center Visitor Complex in Florida to honor space shuttle Challenger's STS-51L crew members who gave their lives for while furthering the cause of exploration and discovery. 2011 marks the 25th anniversary of the loss of Challenger, which broke apart over the Atlantic Ocean 73 seconds into flight on Jan. 28, 1986. Photo credit: NASA/Kim Shiflett

CAPE CANAVERAL, Fla. -- Dr. June Scobee Rodgers, the founding chair of the Challenger Center for Space Science Education and widow of space shuttle Challenger's STS-51L Commander Dick Scobee, left, talks with former Shuttle Launch Director Bob Sieck, NASA Kennedy Space Center Director Bob Cabana and NASA Associate Administrator for Space Operations William Gerstenmaier. They are gathered in front of the Space Mirror Memorial at the Kennedy Space Center Visitor Complex in Florida to honor the Challenger crew members who gave their lives for while furthering the cause of exploration and discovery. 2011 marks the 25th anniversary of the loss of Challenger, which broke apart over the Atlantic Ocean 73 seconds into flight on Jan. 28, 1986. Photo credit: NASA/Kim Shiflett

CAPE CANAVERAL, Fla. -- A crowd gathers in front of the Space Mirror Memorial at the Kennedy Space Center Visitor Complex in Florida to honor space shuttle Challenger's STS-51L crew members who gave their lives for while furthering the cause of exploration and discovery. 2011 marks the 25th anniversary of the loss of Challenger, which broke apart over the Atlantic Ocean 73 seconds into flight on Jan. 28, 1986. NASA/Jack Pfaller

CAPE CANAVERAL, Fla. -- A crowd gathers in front of the Space Mirror Memorial at the Kennedy Space Center Visitor Complex in Florida to honor space shuttle Challenger's STS-51L crew members who gave their lives for while furthering the cause of exploration and discovery. 2011 marks the 25th anniversary of the loss of Challenger, which broke apart over the Atlantic Ocean 73 seconds into flight on Jan. 28, 1986. Photo credit: NASA/Kim Shiflett

CAPE CANAVERAL, Fla. -- A crowd gathers in front of the Space Mirror Memorial at the Kennedy Space Center Visitor Complex in Florida to honor space shuttle Challenger's STS-51L crew members who gave their lives for while furthering the cause of exploration and discovery. 2011 marks the 25th anniversary of the loss of Challenger, which broke apart over the Atlantic Ocean 73 seconds into flight on Jan. 28, 1986. Photo credit: NASA/Kim Shiflett

CAPE CANAVERAL, Fla. -- Stephen Feldman, president of the Astronauts Memorial Foundation, left; Dr. June Scobee Rodgers, founding chair of the Challenger Center for Space Science Education and widow of space shuttle Challenger's STS-51L Commander Dick Scobee; Michael McCulley, former astronaut and chairman of the Astronauts Memorial Foundation; Bob Cabana, former astronaut and NASA Kennedy Space Center director; Rick Soria, 2009 Alan Shepard Technology in Education Award winner, and William Gerstenmaier, NASA Associate Administrator for Space Operations gather in front of the Space Mirror Memorial at the Kennedy Space Center Visitor Complex in Florida to honor the Challenger crew members who gave their lives for while furthering the cause of exploration and discovery. 2011 marks the 25th anniversary of the loss of Challenger, which broke apart over the Atlantic Ocean 73 seconds into flight on Jan. 28, 1986. NASA/Jack Pfaller

CAPE CANAVERAL, Fla. -- The Space Mirror Memorial at the Kennedy Space Center Visitor Complex in Florida will be the site of a memorial ceremony to honor space shuttle Challenger's STS-51L crew members who gave their lives for while furthering the cause of exploration and discovery. 2011 marks the 25th anniversary of the loss of Challenger, which broke apart over the Atlantic Ocean 73 seconds into flight on Jan. 28, 1986. NASA/Jack Pfaller