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Of the countless equinoxes Saturn has seen since the birth of the solar system, this one, captured here in a mosaic of light and dark, is the first witnessed up close by an emissary from Earth ... none other than our faithful robotic explorer, Cassini.

Alien Galaxy: Astronomers believe that the Cartwheel Galaxy's unusual shape is due to a collision with a smaller galaxy about 200 million years ago.

Jets spurting ice particles, water vapor, and trace organic compounds from the surface of Saturn's moon Enceladus.

Time Moves with the Moon by Marcelo Gleiser, NPR: On its way to Jupiter, the Galileo spacecraft looked back and captured this remarkable view of Earth and the moon. - 'As of now, a day becomes longer by about 1.7 microseconds per century. At this rate, half a billion years ago a day lasted a bit over 22 hours and one year had 397 days.