Astronomers say they have for the first time spotted a planet beyond our own in what is sometimes called the Goldilockszone for life: Not too far from its star, not too close. So it could contain liquid water. The planet itself is neither too big nor too small for the proper surface, gravity and atmosphere.

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With an estimated 200 billion stars in the universe, that means maybe 40 billion planets that have the potential for life, Vogt said