Whether you're talking about finding carbon-based molecules on Mars or exoplanets that sit in their star's habitable zone (where liquid water can exist), astronomers are downright obsessed with the search for telltale clues of extraterrestrial life. Those clues make sense: Life on Earth is carbon-based and requires liquid water to exist. But does all life require that? Why can't life be silicon-based and thrive in oceans of liquid mercury? The answer: It could, conceivably. But there are two good reasons we look for life that's more like ourselves.
Related Video: If You Find Aliens, Follow SETI's 9 Rules to Announce It to the World
Dude, Where's My Carbon?
Curiosity Daily Featuring SETI Senior Astronomer Seth Shostak
Written by Ashley Hamer July 20, 2018
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