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In this artist concept provided by NASA, the MAVEN spacecraft approaches Mars on a mission to study its upper atmosphere. AP hide caption

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AP

Mission To Study Mars' Climate Enters Red Planet's Orbit

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The Rosetta spacecraft took this image of comet 67P/Churyumov-Gerasimenko on 4 August 2014 from a distance of just 145 miles. ESA/Rosetta/NAVCAM hide caption

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ESA/Rosetta/NAVCAM

In Quest To Harpoon A Comet, A Spacecraft Stalks Its Prey

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The moon appeared bigger and brighter when it went supermoon on June 23, 2013 — especially when it was seen next to objects on the horizon, such as the helicopter from the original Batman television show at the New Jersey State Fair last year. Julio Cortez/AP hide caption

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Julio Cortez/AP

The Cassini spacecraft has been taking radar images of Titan for years now. This modified image of the Ligeia Mare, a sea on Titan's north pole, is a composite of some of those. NASA/JPL-Caltech/ASI/Cornell hide caption

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NASA/JPL-Caltech/ASI/Cornell

Scientists Observe Springtime Changes On One Of Saturn's Moons

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Astronomers thought they saw a big explosion in the nearby Andromeda galaxy. GALEX, JPL-Caltech/ NASA hide caption

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GALEX, JPL-Caltech/ NASA

Rumors Of An Intergalactic Explosion Are Greatly Exaggerated

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An artist's rendering of Kepler-186f, the first validated Earth-size planet to orbit in the habitable zone of a distant star. T. Pyle/NASA/SETI Institute/JPL-Caltech hide caption

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T. Pyle/NASA/SETI Institute/JPL-Caltech

Scientists Spot A Planet That Looks Like 'Earth's Cousin'

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