Tuesday, June 28, 2011

Tau Day

Happy Tau Day!

Here's Helene, a moon of Saturn, with dimensions of about 36 by 32 by 30 kilometers. The Cassini robot took this picture recently. It's not quite spherical, but nothing is exactly spherical and tau is still a good approximation. There are even mountains on the moon! (Galileo)

(stereo pair, cross-view)

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