#Tweeunion social media participants talk with Orion engineer Stu McClung and astronaut Doug Wheelock about Orion's first flight in the Space Vehicle Mockup Facility in Building 9 of Johnson Space Center in Houston on Jan. 30, 2015. Part of Batch image transfer from Flickr.

#Tweeunion social media participants talk with Orion engineer Stu McClung and astronaut Doug Wheelock about Orion's first flight in the Space Vehicle Mockup Facility in Building 9 of Johnson Space Center in Houston on Jan. 30, 2015. Part of Batch image transfer from Flickr.

#Tweeunion social media participants talk with Orion engineer Stu McClung and astronaut Doug Wheelock about Orion's first flight in the Space Vehicle Mockup Facility in Building 9 of Johnson Space Center in Houston on Jan. 30, 2015. Part of Batch image transfer from Flickr.

#Tweeunion social media participants talk with Orion engineer Stu McClung about Orion's first flight in the Space Vehicle Mockup Facility in Building 9 of Johnson Space Center in Houston on Jan. 30, 2015. Part of Batch image transfer from Flickr.

#Tweeunion social media participants talk with Orion engineer Stu McClung and astronaut Doug Wheelock about Orion's first flight in the Space Vehicle Mockup Facility in Building 9 of Johnson Space Center in Houston on Jan. 30, 2015. Part of Batch image transfer from Flickr.

#Tweeunion social media participants talk with Orion engineer Stu McClung and astronaut Doug Wheelock about Orion's first flight in the Space Vehicle Mockup Facility in Building 9 of Johnson Space Center in Houston on Jan. 30, 2015. Part of Batch image transfer from Flickr.

CAPE CANAVERAL, Fla. -- Social media participants are briefed on the Space Launch System rocket by Stu McClung, NASA's deputy manager of the Orion Production Office. They were on hand for the upcoming launch of the Mars Atmosphere and Volatile Evolution, or MAVEN, mission. Their visit included tours of key facilities at the Florida Spaceport and participating in presentations by key NASA leaders who updated the space agency's current efforts. Photo credit: NASA/Jim Grossman

CAPE CANAVERAL, Fla. -- Social media participants are briefed on the Space Launch System rocket by Stu McClung, NASA's deputy manager of the Orion Production Office. They were on hand for the upcoming launch of the Mars Atmosphere and Volatile Evolution, or MAVEN, mission. Their visit included tours of key facilities at the Florida Spaceport and participating in presentations by key NASA leaders who updated the space agency's current efforts. Photo credit: NASA/Jim Grossman

CAPE CANAVERAL, Fla. -- In the Operations and Checkout Building of NASA's Kennedy Space Center in Florida, agency astronauts are briefed on preparations for the launch the Orion spacecraft on Exploration Flight Test EFT-1. Plans call for the Lockheed Martin-built Orion to launch atop a United Launch Alliance Delta IV Heavy rocket from Cape Canaveral Air Force Station. Participating in the briefing, from the left, are Jules Schneider senior manager of Project Engineering for Lockheed Martin, center director Bob Cabana, Stu Mcclung, of NASA at the Johnson Space Center, Josh Cassada, Jessica Meir, Andrew Morgan, Christina Hammock, Victor Glover, Nicole Mann, Anne McClain and Tyler Nick Hague. The astronaut class of 2013 was selected by NASA after an extensive year-and-a-half search. The new group will help the agency push the boundaries of exploration and travel to new destinations in the solar system. To learn more about the astronaut class of 2013, visit: http:__www.nasa.gov_astronauts_2013astroclass.html Photo credit: NASA_Kim Shiflett

CAPE CANAVERAL, Fla. -- In the Operations and Checkout Building of NASA's Kennedy Space Center in Florida, agency astronaut candidates are briefed on preparations for the launch the Orion spacecraft on Exploration Flight Test EFT-1. Plans call for the Lockheed Martin-built Orion to launch atop a United Launch Alliance Delta IV Heavy rocket from Cape Canaveral Air Force Station. The astronaut class of 2013 was selected by NASA after an extensive year-and-a-half search. The new group will help the agency push the boundaries of exploration and travel to new destinations in the solar system. To learn more about the astronaut class of 2013, visit: http://www.nasa.gov/astronauts/2013astroclass.html Photo credit: NASA/Kim Shiflett