On this day in 1655…
Discovered on 25 March 1655 by Christiaan Huygens, Titan was the first known moon of Saturn. It’s the only place in the solar system, other than Earth, that has stable liquids on its surface. In this case, the liquid consists of ethane and methane rather than water.
What lay under its thick atmosphere was largely a mystery until 2005, when Huygens probe landed on the surface. The best information and images of this natural satellite are made possible by the Cassini-Huygens mission, a cooperative project of NASA, the European Space Agency and the Italian Space Agency.
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