Cassini gives Dione a close shave

Bad Astronomy
By Phil Plait
Dec 13, 2011 5:00 PMNov 20, 2019 4:16 AM

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The Cassini spacecraft has been touring Saturn and its moons for 7 years now, and yet still manages to send back images that are simply astonishing. Just yesterday, the probe swung past the icy moon Dione at a distance of just 99 kilometers (62 miles) over the surface! Compare that to the moon's diameter of over 1100 km (670 miles) and you get an impression of how close that was. The purpose of the pass was to get infrared spectra of the moon, so only a few visible light images were taken. But oh, what pictures they were! Check this out:

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