Life on Mars? Let's look in caves: Penelope Boston on TED.com

So the Mars Rovers didn’t scoop up any alien lifeforms … ? Scientist Penelope Boston thinks there’s a good chance — a 25 to 50 percent chance, in fact — that life might exist on Mars, deep inside the planet’s caves. She details how we should look and why. (Recorded February 2006 in Monterey, California. Duration: 18:29.)

Watch Penelope Boston’s talk on TED.com, where you can download this TEDTalk, rate it, comment on it and find other talks and performances from our archive of 350+ TEDTalks — including more talks about exploration.

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