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.
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.
A. M. Quetz/MPIA
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.
Planetary Habitability Laboratory/University of Puerto Rico at Arecibo