Astronomy Picture of the Day Discover the cosmos! Each day we
feature a different image or photograph of our fascinating
universe, along with a brief explanation written by a November
24, 1995 Saturn's Moon Tethys Copyright Calvin J. Hamilton
Tethys is one of the larger and closer moons of Saturn. It was
visited by both Voyager spacecraft - Voyager 1 in November 1980
and by Voyager 2 in Tethys is now known to be composed almost
completely of water ice. Tethys shows a large impact crater that
nearly circles the planet. That the impact that caused this
crater did not disrupt the moon is taken as evidence that Tethys
was not completely frozen in its past. Tethys has two moons
named Calypso that orbit just ahead of it and behind it. Tethys
was originally discovered in 1684 by Tomorrow's picture:
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