Ask a Physicist: What does it take to discover an earth-like exoplanet?

In my latest column, I give an overview on how we search for exoplanets, how we’re just now at the point of finding new terrestrial planets, and why we might miss a second earth, even if it was practically right next door.

If you’re visiting from io9, be sure to check out the common tags to the right (especially astronomy and physics), and if you have questions of your own, be sure to ask them.

-Dave

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