The First Exoplanet Orbiting Three Stars

Residing 1,300 light-years away in the famous constellation Orion the Hunter is the triple-star system GW Orionis. Of its three stars, two closely orbit each other, while a third orbits the pair. These stellar triplets are young, still surrounded by a disk of dust, gas, and debris left over from their formation. And this disk, called a protoplanetary disk, has caught astronomers’ attention for several reasons — not least of which because it might harbor the first known exoplanet orbiting a trio of stars.

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