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...DNA, not too much harmful radiation, a source of energy. The TRAPPIST-1 planets are orbiting a star which is very close to the Sun, at least ‘close’ in the context of the size of our Galaxy. Low-mass planets orbiting dim stars are intrinsically quite difficult to find and study. The fact that we are finding potentially habitable planets so close to us tends to suggest...

...DNA stuff, but we check the nature of the rocks. What do they look like? Some rocks are breccias. They look like the cross section of a sidewalk. They're put together with all the little pieces all stuck together. That's a breccia. And so we find those, but we look at each individual portion of the breccia, and it comes from a different place, from a different rock. So...