Nasa

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This panorama provided by NASA of a Martian hilltop was taken Jan. 6, 2015, by the NASA rover Opportunity. (NASA via Associated Press)

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This image made available by NASA on Friday, July 24, 2015 shows Pluto made by combining several images from two cameras on the New Horizons spacecraft. The images were taken when the spacecraft was 280,000 miles (450,000 kilometers) away from Pluto. (NASA/JHUAPL/SwRI via AP)

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FILE - In this Wednesday, March 4, 2015 photo provided by NASA, astronaut Scott Kelly sits inside a Soyuz simulator at the Gagarin Cosmonaut Training Center (GCTC) in Star City, Russia. On Thursday, July 16, 2015, a piece of space junk forced the three International Space Station astronauts, including Kelly, to seek emergency shelter in their Soyuz spacecraft docked to the station, in case they had to make a quick getaway. (Bill Ingalls/NASA via AP)

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This July 13, 2015, image provided by NASA shows Pluto, seen from the New Horizons spacecraft. The United States is now the only nation to visit every single planet in the solar system. Pluto was No. 9 in the lineup when New Horizons departed Cape Canaveral, Fla, on Jan. 19, 2006 (NASA via AP)

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This July 13, 2015 image provided by NASA shows Pluto from the New Horizons spacecraft. The United States is now the only nation to visit every single planet in the solar system. Pluto was No. 9 in the lineup when New Horizons departed Cape Canaveral, Fla, on Jan. 19, 2006 (NASA via AP)

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This July 11, 2015, image provided by NASA shows Pluto from the New Horizons spacecraft. On Tuesday, July 14, NASA's New Horizons spacecraft will come closest to Pluto. New Horizons has traveled 3 billion miles over 9½ years to get to the historic point. (NASA/JHUAPL/SWRI via AP)

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This July 11, 2015, image provided by NASA shows Pluto from the New Horizons spacecraft. (Associated Press)

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This July 11, 2015, image provided by NASA shows Pluto from the New Horizons spacecraft. (Associated Press)

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NASA used rapid prototyping to build its Greased Lightning (GL-10) drone, which has 10 engines and can fly like a helicopter or an plane. (Image: NASA)

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In this April 25, 1990, photograph provided by NASA, most of the giant Hubble Space Telescope can be seen as it is suspended in space by Discovery's Remote Manipulator System (RMS) following the deployment of part of its solar panels and antennae. (NASA via AP)

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(Image: NASA)

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In this photo provided by NASA, astronaut Scott Kelly sits inside a Soyuz simulator at the Gagarin Cosmonaut Training Center (GCTC), Wednesday, March 4, 2015 in Star City, Russia. On Saturday, March 28, 2015, Kelly and cosmonaut Mikhail Kornienko will travel to the International Space Station to begin a year-long mission living in orbit. (AP Photo/NASA, Bill Ingalls)

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Life there, once upon a time? NASA scientists say a primitive ocean on Mars held more water than Earth's Arctic Ocean. (NASA/GSFC)

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This Feb. 19, 2015, file image provided by NASA shows the dwarf planet Ceres, taken by the space agency's Dawn spacecraft from a distance of nearly 29,000 miles (46,000 kilometers). On Friday, March 6, 2015, NASA’s Dawn spacecraft arrives at the mysterious dwarf planet located in the asteroid belt between Mars and Jupiter after a nearly eight-year journey. (AP Photo/NASA/JPL-Caltech/UCLA/MPS/DLR/IDA, File)

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In this image made from video provided by NASA, Italian astronaut Samantha Cristoforetti checks the helmet of astronaut Terry Virts inside the International Space Station on Wednesday, Feb. 25, 2015. Virts reported the water while he waited in the air lock for Wednesday's spacewalk to formally conclude. (AP Photo/NASA) ** FILE **