Pictures: NASA’s Space Launch System (SLS) and Orion capsule

The completed mobile launcher structure that will support NASA’s Space Launch System (SLS) at the Kennedy Space Center is seen, Wednesday, Aug. 19, 2015, in Cape Canaveral, Fla. SLS is the agency’s new rocket that will launch astronauts in the Orion spacecraft on missions to an asteroid and eventually to Mars. (AP Photo/John Raoux) ORG XMIT: KSC102  (John Raoux / Associated Press)

The new Orion crew capsule is catapulted into the air on Thursday, May 6, 2010 at White Sands Missile Range, N.M., during a test of Orion’s launch-abort system, which will whisk astronauts and the capsule to safety in case of a problem on the launch pad, such as a fire, or during the climb to orbit. The Orion capsule was originally designed to take astronauts back to the moon. But President Obama in February killed NASA’s $100 billion plans to return to the moon, redirecting the money for new rocket technology research. (AP Photo/Craig Fritz)  ( / AP)

The new Orion crew capsule, far left, is shown on Thursday, May 6, 2010 at White Sands Missile Range, N.M., during a test of Orion’s launch-abort system, which will whisk astronauts and the capsule to safety in case of a problem on the launch pad, such as a fire, or during the climb to orbit. The Orion capsule was originally designed to take astronauts back to the moon. But President Obama in February killed NASA’s $100 billion plans to return to the moon, redirecting the money for new rocket technology research. (AP Photo/Craig Fritz)  ( / AP)

The new Orion crew capsule with parachutes deployed is shown after it was catapulted into the air on Thursday, May 6, 2010 at White Sands Missile Range, N.M., during a test of Orion’s launch-abort system, which will whisk astronauts and the capsule to safety in case of a problem on the launch pad, such as a fire, or during the climb to orbit. The Orion capsule was originally designed to take astronauts back to the moon. But President Obama in February killed NASA’s $100 billion plans to return to the moon, redirecting the money for new rocket technology research. (AP Photo/Craig Fritz)  ( / AP)

The new Orion crew capsule, far left, is shown on Thursday, May 6, 2010 at White Sands Missile Range, N.M., during a test of Orion’s launch-abort system, which will whisk astronauts and the capsule to safety in case of a problem on the launch pad, such as a fire, or during the climb to orbit. The Orion capsule was originally designed to take astronauts back to the moon. But President Obama in February killed NASA’s $100 billion plans to return to the moon, redirecting the money for new rocket technology research. (AP Photo/Craig Fritz)  ( / AP)

The new Orion crew capsule with parachutes deployed is shown after it was catapulted into the air on Thursday, May 6, 2010 at White Sands Missile Range, N.M., during a test of Orion’s launch-abort system, which will whisk astronauts and the capsule to safety in case of a problem on the launch pad, such as a fire, or during the climb to orbit. The Orion capsule was originally designed to take astronauts back to the moon. But President Obama in February killed NASA’s $100 billion plans to return to the moon, redirecting the money for new rocket technology research. (AP Photo/Craig Fritz)  ( / AP)

The new Orion crew capsule is catapulted into the air on Thursday, May 6, 2010 at White Sands Missile Range, N.M., during a test of Orion’s launch-abort system, which will whisk astronauts and the capsule to safety in case of a problem on the launch pad, such as a fire, or during the climb to orbit. The Orion capsule was originally designed to take astronauts back to the moon. But President Obama in February killed NASA’s $100 billion plans to return to the moon, redirecting the money for new rocket technology research. (AP Photo/Craig Fritz)  ( / AP)

A test model of the Orion Crew Exploration Vehicle, NASA’s next-generation space capsule, is rolled out at Edwards Air Force Base in the Mojave Desert in October 2008. The Orion vehicle looks strikingly similar to the Apollo space capsule, but it is larger and will carry six astronauts instead of three. NASA is aiming to send Americans to the moon aboard Orion by 2020.  (Irfan Khan/Los Angeles Times)

The NASA Orion Crew Exploration Vehicle arrives on a flatbed truck for display on the National Mall March 30, 2009 on Capitol Hill in Washington, DC. America will send a new generation of explorers to the moon aboard NASA’s Orion crew exploration vehicle. Making its first flights to the International Space Station early in the next decade, Orion is part of the Constellation Program to send human explorers back to the moon, and then onward to Mars and other destinations in the solar system.  (Tim Sloan / AFP / Getty Images)

A full-size mockup of the Orion crew exploration vehicle is displayed by NASA on the National Mall March 30, 2009 in Washington, DC. The Orion crew exploration vehicle is scheduled to begin carrying humans to the International Space Station in 2015.   (Win McNamee / Getty Images)

The NASA Orion crew exploration vehicle arrives on a flatbed truck for display on the National Mall March 30, 2009 on Capitol Hill in Washington, DC. The Orion crew exploration vehicle is targeted to begin carrying humans to the International Space Station in 2015.   (Tim Sloan / AFP / Getty Images)

A full-size mockup of the Orion crew exploration vehicle is displayed by NASA on the National Mall March 30, 2009 in Washington, DC. The Orion crew exploration vehicle is scheduled to begin carrying humans to the International Space Station in 2015.   (Win McNamee / Getty Images)

Schoolchildren gather around a full-size mockup of the Orion crew exploration vehicle which NASA displayed on the National Mall March 30, 2009 in Washington, DC. The Orion crew exploration vehicle is scheduled to begin carrying humans to the International Space Station in 2015.   (Win McNamee / Getty Images)

Schoolchildren gather around a full-size mockup of the Orion crew exploration vehicle which NASA displayed on the National Mall March 30, 2009 in Washington, DC. The Orion crew exploration vehicle is scheduled to begin carrying humans to the International Space Station in 2015.   (Win McNamee / Getty Images)

A full-size mockup of the Orion crew exploration vehicle is displayed on the National Mall in Washington, Monday, March 30, 2009.  (Haraz N. Ghanbari / Associated Press)

With the capitol in the background, a full-size mockup of the Orion crew exploration vehicle is displayed on the National Mall in Washington, Monday, March 30, 2009.  (Haraz N. Ghanbari / Associated Press)

The NASA Orion crew exploration vechicle arrives on a flatbed truck for display on the National Mall March 30, 2009 on Capitol Hill in Washington, DC. The Orion crew exploration vechicle is targeted to begin carrying humans to the International Space Station in 2015.   (Tim Sloan / AFP / Getty Images)

Schoolchildren gather around a full-size mockup of the Orion crew exploration vehicle which NASA displayed on the National Mall March 30, 2009 in Washington, DC. The Orion crew exploration vehicle is scheduled to begin carrying humans to the International Space Station in 2015.   (Win McNamee / Getty Images)

A full-size mockup of the Orion crew exploration vehicle is displayed on the National Mall in Washington, Monday, March 30, 2009.  (Haraz N. Ghanbari / Associated Press)