Nasa

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This undated artist rendering released by NASA shows the Deep Impact spacecraft. In 2005, it smashed a comet with a projectile to give scientists a peek of the interior. The spacecraft went on to rendezvous with two more comets. On Friday, Sept. 20, 2013, the space agency declared an end to the mission after failing to regain contact with the spacecraft. (AP Photo/NASA)

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An frog is launched through the air as NASA's LADEE spacecraft lifts off from the Wallops/Mid-Atlantic Regional Spaceport in Virginia. (Image: NASA)

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An frog is launched through the air as NASA's LADEE spacecraft lifts off from the Wallops/Mid-Atlantic Regional Spaceport in Virginia. (Image: NASA)

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This artist rendering released by NASA shows NASA’s Voyager 1 spacecraft barreling through space. The space agency announced Thursday, Sept. 12, 2013, that Voyager 1 has become the first spacecraft to enter interstellar space, or the space between stars, more than three decades after launching from Earth. (AP Photo/NASA)

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The Lunar Atmosphere and Dust Environment Explorer aboard a Minotaur V rocket appears after a rollout at NASA's Wallops Island test flight facility in Wallops Island, Va., Thursday Sept. 5, 2013. The LADEE spacecraft is set to launch from Wallops Island Friday evening. (AP Photo/NASA, Patrick Black)

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NASA has asked for suggestions on how to re-purpose three mobile launch platforms, built in 1967, that are going unused at Kennedy Space Center in Florida. Each two-story structure weighs around 8.2 million pounds, and is 160 feet long and 135 feet wide.

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In this image from video made available by NASA, astronauts discuss the aborted spacewalk aboard the International Space Station on Tuesday, July 16, 2013. A dangerous water leak in the helmet of Luca Parmitano, bottom center facing camera in white suit, drenched his eyes, nose and mouth, preventing him from hearing or speaking as what should have been a routine spacewalk came to an abrupt end. (AP Photo/NASA)

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** FILE ** This image released by NASA on Monday, May 20, 2013, shows a hole in a Martian rock drilled by the NASA rover Curiosity on May 19. It’s the second drilling by the spacecraft since landing in August 2012. Curiosity used the Mars Hand Lens Imager (MAHLI) camera on the rover's arm to capture this view of the hole in the rock, dubbed "Cumberland." The diameter of the hole is about 0.6 inch (1.6 centimeters), the depth about 2.6 inches (6.6 centimeters). In the coming days, Curiosity will transfer the rock powder to its onboard instruments to analyze the chemical makeup. (Associated Press/NASA/JPL-Caltech/MSSS)