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Kepler 90 system

THIRD ROCK  The keen eye of an AI program discovered that the star system Kepler 90, illustrated here, has an eighth world (dubbed Kepler 90i), which was previously overlooked in exoplanet searches.

illustration of TRAPPIST-1

SEVEN IN ONE GO  The small, cool star TRAPPIST-1, illustrated here, hosts a bevy of Earth-sized planets. There could be many more stars like it worth studying.

55 Cancri e

NOT LIKE HOME  Rocky super-Earth 55 Cancri e, seen in this artist’s illustration, is about Earth’s size, but a new study suggests it and other similar hot exoplanets probably formed in a completely different way than Earth did.

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