<p>Two of <a href="http://news.nationalgeographic.com/2015/03/150311-enceladus-astrobiology-life-saturn-space-planet/">Saturn's moons</a>, Mimas (right) and Dione (left), straddle the planet's rings in an image from <a href="http://www.nasa.gov/mission_pages/cassini/main/index.html">Cassini</a>. At over 75,000 miles across, Saturn dwarfs its companions: Mimas is about 250 miles across while Dione is 700 miles in diameter.</p>
Tiny Moons
Two of Saturn's moons, Mimas (right) and Dione (left), straddle the planet's rings in an image from Cassini. At over 75,000 miles across, Saturn dwarfs its companions: Mimas is about 250 miles across while Dione is 700 miles in diameter.
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