On 25 March 1655, the Dutch astronomer Christiaan Huygens discovered Titan, the first known moon of Saturn. It is the only natural satellite known to have a dense atmosphere. Titan is primarily composed of water ice and rocky material.
The colorful globe of Saturn’s largest moon, Titan, passes in front of the planet and its rings in this true color snapshot from NASA’s Cassini spacecraft taken on May 21, 2011 and released on Dec. 22.
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