Are We Alone in the Universe?

Charles Krauthammer, Washington Post
Huge excitement last week. Two Earth-size planets found orbiting a sun-like star less than a thousand light-years away. This comes two weeks after the stunning announcement of another planet orbiting another star at precisely the right distance — within the “habitable zone” that is not too hot and not too cold — to allow for liquid water and therefore possible life.Unfortunately, the planets of the right size are too close to their sun, and thus too scorching hot, to permit Earth-like life. And the Goldilocks planet in the habitable zone is too large....

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