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NASA’s Cassini spacecraft scientists announce that a form of chemical energy that can feed life appears to exist on Saturn’s moon Enceladus, and Hubble researchers report additional evidence of plumes erupting from Jupiter’s moon Europa.

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Today is the 25th anniversary of Hubble Space Telescope’s launch! NASA is celebrating with a special Hubble 25th website: x. Hover over the photos below for info.

This one's the hero of our story:

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Did you know that lots of asteroids have moons? Check it out:

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