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Illustration of Kepler 11

FIRST DRAFT  The solar system may have once hosted several large rocky planets close to the sun, like Kepler 11 (illustrated) does, before Jupiter swept them away.

OTS 44

GOING ROGUE  A disk of gas and dust swirls around OTS 44, a rogue planet shown in this artist’s illustration. It may have formed the same way stars are made.

Super Earth vs. Earth

BULKING UP   The formation of super-Earths like Gliese 832c, a potentially habitable planet roughly 5 times as massive as Earth (illustrated here), puzzles astronomers. New research suggests that not all super-Earths form the same way.

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