Astronomers have discovered an Earth-sized planet in the habitable zone of a red dwarf—a star cooler than the sun—500 light-years away. Because such stars make up three-quarters of all stars in the Milky Way, the finding could open a wide new hunting ground for extraterrestrial life.

The planet, called Kepler-87b, is in the habitable zone of a red dwarf star, which could open a new hunting ground for extraterrestrial life.

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Astronomy. Almost-Earth tantalizes astronomers with promise of worlds to come.

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