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This April 12, 2017 image provided by NASA shows planet Earth and the moon, center left, as small points of light behind the rings of Saturn, captured by the Cassini spacecraft, 870 million miles (1.4 billion kilometers) away from Earth. 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 via AP)

This April 12, 2017 image provided by NASA shows planet Earth and the moon, center left, as small points of light behind the rings of Saturn, captured by the Cassini spacecraft, 870 million miles (1.4 billion kilometers) away from Earth. 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 via AP)

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