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This photo provided by NASA shows water vapor jets, emitted from the southern polar region of Saturn's moon Enceladus. Scientists have uncovered a vast ocean beneath the icy surface of the moon, they announced Thursday, April 3, 2014. Italian and American researchers made the discovery using Cassini, a NASA-European spacecraft still exploring Saturn and its rings 17 years after its launch from Cape Canaveral. (AP Photo/NASA, JPL, Caltec, Space Science Institute)

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This illustration provided by NASA and based on Cassini spacecraft measurements shows the possible interior of Saturn's moon Enceladus - an icy outer shell and a low density, rocky core with a regional water ocean sandwiched in between the two at southern latitudes. Plumes of water vapor and ice, first detected in 2005, are depicted in the south polar region. Scientists have uncovered a vast ocean beneath the icy surface of the moon, they announced Thursday, April 3, 2014. Italian and American researchers made the discovery using Cassini, a NASA-European spacecraft still exploring Saturn and its rings 17 years after its launch from Cape Canaveral. (AP Photo/NASA, JPL, Caltech)

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This undated photo provided by NASA on April 2, 2014 shows Saturn's moon Enceladus. The "tiger stripes" are long fractures from which water vapor jets are emitted. Scientists have uncovered a vast ocean beneath the icy surface of the moon, they announced Thursday, April 3, 2014. Italian and American researchers made the discovery using Cassini, a NASA-European spacecraft still exploring Saturn and its rings 17 years after its launch from Cape Canaveral. (AP Photo/NASA, JPL, Space Science Institute)

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This 1963 photo provided by NASA shows an F-1 Engine for the Saturn V S-IC (first) stage at Marshall Space Flight Center in Huntsville, Ala. An undersea expedition spearheaded by Amazon.com CEO and founder Jeff Bezos with Jay Larsen, whose deep ocean surveying company, SL Hydrospheric LLC were tapped to find what he said were the F-1 engines that helped boost the Apollo 11 mission on July 16, 1969 located 14,000 feet deep in the Atlantic. (AP Photo/NASA)

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In this handout image provided by NASA’s Jet Propulsion Laboratory, a scanning lidar, which measure’s snow’s depth with lasers, left, and an imaging spectrometer that measures how fast the snow is melting into runoff are seen before a flight to measure the snowpack in California’s Sierra Nevada mountains on Sunday, March 23, 2014. (AP Photo/NASA Jet Propulsion Laboratory)

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In this handout image provided by NASA’s Jet Propulsion Laboratory, scientists fly over the Tuolumne River Basin of California’s Sierra Nevada mountain range to measure the snowpack on Sunday, March 23, 2014. The new Airborne Snow Observatory measures the snowpack’s depth and water content with precision amid California’s drought. (AP Photo/NASA Jet Propulsion Laboratory)

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Expedition 39 Soyuz commander Aleksander Skvortsov, of the Russian Federal Space Agency (Roscosmos), followed by, flight engineer Steve Swanson of NASA, middle, and flight engineer Oleg Artemyev of Roscosmos, wave farewell prior to boarding the Soyuz rocket for launch from the Baikonur Cosmodrome Wednesday, March 26, 2014, in Baikonur, Kazakhstan. (AP Photo/NASA, Joel Kowsky) MANDATORY CREDIT