Nasa

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This image made by the Cassini spacecraft and provided by NASA on March 12, 2006, shows two of Saturn's moons, the small Epimetheus and smog-enshrouded Titan, with Saturn's A and F rings stretching across the frame. Launched in 1997, Cassini reached Saturn in 2004 and has been exploring it from orbit ever since. Cassini’s fuel tank is almost empty, so NASA has opted for a risky, but science-rich grand finale. (AP Photo/NASA)

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This undated photo made available by NASA shows one of Saturn's moons, Mimas, dwarfed by the planet's rings. Launched in 1997, Cassini reached Saturn in 2004 and has been exploring it from orbit ever since. Cassini’s fuel tank is almost empty, so NASA has opted for a risky, but science-rich grand finale. (NASA/JPL-Caltech/Space Science Institute via AP)

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This image made available by NASA in April 2017 shows a still from the short film "Cassini's Grand Finale," with the spacecraft diving between Saturn and the planet's innermost ring. Launched in 1997, Cassini reached Saturn in 2004 and has been exploring it from orbit ever since. Cassini’s fuel tank is almost empty, so NASA has opted for a risky, but science-rich grand finale. (NASA/JPL-Caltech via AP)

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A NASA employee gives a demonstration at the 'Earth Day in the Nation's Capital' event on Thursday. NASA honors the day with an activity-packed event meant to engage public in science. (Julia Brouillette / The Washington Times)

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In this Thursday, April 13, 2017 image from video made available by NASA, astronaut Peggy Whitson speaks during an interview aboard the International Space Station. The commander of the ISS says that five months into her current mission, she’s still not bored. At 57, she's the oldest woman to fly in space and is on the verge of setting a U.S. record for most accumulated time in space. (NASA via AP)

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The Soyuz MS-02 spacecraft is seen as it lands with Expedition 50 Commander Shane Kimbrough of NASA and Flight Engineers Sergey Ryzhikov and Andrey Borisenko of Roscosmos near Dzhezkazgan, Kazakhstan on Monday, April 10, 2017. Kimbrough, Ryzhikov, and Borisenko returned from the International Space Station. (Bill Ingalls/NASA via AP)

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This composite image provided by NASA on Thursday, June 30, 2016 shows auroras on the planet Jupiter. This image produced by NASA using a photograph captured by the Hubble Space Telescope in spring 2014, and ultraviolet observations of the auroras in 2016. On Tuesday, April 11, 2017, scientists reported a "Great Cold Spot" in the thermospehere of the planet. And unlike the giant planet’s familiar Great Red Spot, this newly discovered weather system is continually changing in shape and size. It's formed by the energy from Jupiter's polar auroras. (NASA/ESA/Hubble via AP)

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NASA astronaut Shane Kimbrough, left, Russian cosmonaut Sergey Ryzhikov of Roscosmos, center, and Russian cosmonaut Andrey Borisenko of Roscosmos sit in chairs outside the Soyuz MS-02 spacecraft a few moments after they landed in a remote area near Dzhezkazgan, Kazakhstan on Monday, April 10, 2017. Kimbrough, Ryzhikov, and Borisenko returned from the International Space Station. (Bill Ingalls/NASA via AP)

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NASA astronaut Shane Kimbrough rests in a chair outside the Soyuz MS-02 spacecraft just minutes after he, Russian cosmonaut Sergey Ryzhikov of Roscosmos, and Russian cosmonaut Andrey Borisenko of Roscosmos landed near Dzhezkazgan, Kazakhstan on Monday, April 10, 2017. Kimbrough, Ryzhikov, and Borisenko returned from the International Space Station. (Bill Ingalls/NASA via AP)

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In this Jan. 13, 2017 photo made available by NASA, astronaut Peggy Whitson, center, floats inside the Quest airlock of the International Space Station with Thomas Pesquet, left, and Shane Kimbrough before their spacewalk. On Wednesday, April 5, 2017, NASA announced that Whitson will remain on the ISS until September 2017, adding three months to her original mission. (NASA via AP)

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This image made available by NASA in March 2017 shows Pluto illuminated from behind by the sun as the New Horizons spacecraft travels away from it at a distance of about 120,000 miles (200,000 kilometers). On Friday, April 7, 2017, the spacecraft will reach a halfway between Pluto and its next much, much smaller stop, the Kuiper Belt object 2014 MU69. (NASA/Johns Hopkins University Applied Physics Laboratory/Southwest Research Institute via AP)

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In this image made from video provided by NASA, U.S. astronauts Shane Kimbrough, left, and Peggy Whitson, install a shield on a relocated docking port outside of the International Space Station on Thursday, March 30, 2017. An important piece of micrometeorite shielding was lost during the spacewalk at another part of the station earlier in the day. (NASA via AP)

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In this image made from video provided by NASA, U.S. astronauts Peggy Whitson, above, and Shane Kimbrough work on the outside of the International Space Station on Thursday, March 30, 2017. An important piece of micrometeorite shielding was lost during the spacewalk. (NASA via AP)

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This still image taken from NASA shows NASA astronaut Peggy Whitson during a space walk at the International Space Station on Thursday, March 30, 2017. Whitson, the world's oldest and most experienced spacewoman has just set another record, her eighth spacewalk. Whitson and her spacewalking partner, Shane Kimbrough need to complete prep work on a docking port. (NASA via AP)

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This still image taken from live video provided by NASA shows astronaut Shane Kimbrough, right, works on the International Space Station during a space walk on Friday, March 24, 2017. Kimbrough and France's Thomas Pesquet emerged early from the orbiting complex, then went their separate ways to accomplish as much as possible 250 miles up. Their main job involves disconnecting an old docking port. This port needs to be moved in order to make room for a docking device compatible with future commercial crew capsules. (NASA via AP)

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In this image provided by the National Snow and Ice Data Center and NASA, shows how low sea ice levels were in the Arctic this winter, alarming climate scientists. During the winter, Arctic sea ice grew to 5.57 million square miles (14.42 million square kilometers) at its peak, but that’s the smallest amount of winter sea ice in 38 years of record keeping, beating the record set in 2015 and tied last year. Sea ice in March of this year was smaller than last year by an area about the size of the state of Maine. (National Snow and Ice Data Center and NASA via AP)

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This image made available on Feb. 15, 2017 by NASA shows an artist's concept of the launch of the Space Launch System rocket and Orion capsule. On Friday, Feb. 24, 2017, NASA said it is weighing the risk of adding astronauts to the first flight of its new megarocket. (NASA/Marshall Space Flight Center via AP)

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FILE - This undated image shows shows an artist's rendering of NASA's Juno spacecraft making a close pass over Jupiter. On Thursday, Feb. 23, 2017, NASA said its the spacecraft is stuck making long laps around the gas giant because of sticky valves. (NASA via AP)

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This Dec. 11, 2016 image made available by NASA shows Jupiter's northern latitudes made by the spacecraft Juno as it performed a close flyby of the gas giant planet. On Thursday, Feb. 23, 2017, NASA said its the spacecraft is stuck making long laps around the gas giant because of sticky valves. (NASA/JPL-Caltech/SwRI/MSSS/Gerald Eichstaedt/John Rogers via AP)

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This image provided by NASA/JPL-Caltech shows an artist's conception of what the surface of the exoplanet TRAPPIST-1f may look like, based on available data about its diameter, mass and distances from the host star. The planets circle tightly around a dim dwarf star called Trappist-1, barely the size of Jupiter. Three are in the so-called habitable zone, where liquid water and, possibly life, might exist. The others are right on the doorstep. (NASA/JPL-Caltech via AP)