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THREE’S A CROWD  A frozen, rocky planet orbits one of a pair of faint red stars (center and right), roughly 3,300 light-years away, as seen in an artist’s illustration. 

Gliese 581g, the planet in the foreground of this illustration, may not exist. A new study asserts that the star Gliese 581 (red) hosts only the three other depicted planets, all of which are too hot to sustain life.

SUN FLOWER A starshade accompanying a proposed planet-hunting telescope, shown in an illustration, would block starlight and make it easier for the telescope to glimpse any planets orbiting distant stars.

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