Thoughts from a Planetarian: E.T.

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Enceladus

Plumes of water vapor erupting from Saturn’s icy moon Enceladus show that key ingredients for life on Earth, such as liquid water and heat, might not be as rare as we once thought. (Photographed by NASA’s Cassini probe.)

I can’t tell you whether or not there are aliens. What I can tell you is why it’s so hard to find out.

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