Forever alone? How NASA’s Kepler craft is finding another Earth


Late last week, NASA announced that scientists using its Kepler space observatory had discovered two new planetary systems thousands of light years away from our own. Within these, seven new planets were found, and three of them are located in the sweet spot around their stars that makes it not too hot, nor too cold, for liquid water to exist on their surfaces. That fits one of two major criteria for what NASA considers a habitable planet, meaning that these three new worlds are technically capable of supporting the kinds of life we see here on Earth.

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