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Artist’s illustration of NASA’s New Horizons spacecraft passing Pluto and Pluto’s largest moon, Charon, on July 14, 2015.

Artist’s illustration of NASA’s New Horizons spacecraft passing Pluto and Pluto’s largest moon, Charon, on July 14, 2015.

Saturn eclipsing the sun, with the Earth visible in the upper left section of Saturn's rings. In 2009, NASA's robotic Cassini spacecraft drifted in Saturn's shadow for about 12 hours and Cassini saw a view unlike any other.  The rings light up so much that new rings were discovered. (NASA/APOD)

Saturn eclipsing the sun, with the Earth visible in the upper left section of Saturn's rings. In 2009, NASA's robotic Cassini spacecraft drifted in Saturn's shadow for about 12 hours and Cassini saw a view unlike any other. The rings light up so much that new rings were discovered. (NASA/APOD)

Uranus is the third largest planet in our Solar System. Uranus has nine major rings and 27 known moons. This image, taken by the Hubble Space Telescope in infrared reveals cloud structures not normally visible. Methane gas in the upper atmosphere absorbs red light, giving the planet its blue-green color. Uranus is spinning on its side, probably because of a collision with a large object early in the Solar System's history.

Uranus is the third largest planet in our Solar System. Uranus has nine major rings and 27 known moons. This image, taken by the Hubble Space Telescope in infrared reveals cloud structures not normally visible. Methane gas in the upper atmosphere absorbs red light, giving the planet its blue-green color. Uranus is spinning on its side, probably because of a collision with a large object early in the Solar System's history.

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