Article: Do new planets mean life in other worlds?

Ever since at least the time of the ancient Greek empire, people have wondered whether there might be other worlds like our own, and whether those worlds might be inhabited. Now, astronomers have taken a giant step toward answering those questions.

Last fall, two astronomers from Geneva Observatory in Switzerland reported that they had discovered a planet orbiting another star exactly like the sun -- the first time such a planet had ever been found outside our own solar system. Then, two weeks ago, two astronomers from San Francisco State University announced that they had found two more planets, orbiting two other sun-like stars about 35 light years (or 200 trillion miles) away.

All of a ...

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