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  Formation of a Planetary System (Concept)

Formation of a Planetary System

This artist's concept shows a brown dwarf surrounded by a swirling disk of planet-building dust. NASA's Spitzer Space Telescope spotted such a disk around a low-mass brown dwarf, or "failed star." The brown dwarf, called OTS 44, is only 15 times the size of Jupiter, making it the smallest brown dwarf known to host a planet-forming, or protoplanetary disk.

Astronomers believe that this unusual system will eventually spawn planets. If so, they speculate that OTS 44's disk has enough mass to make one small gas giant and a few Earth-sized rocky planets. OTS 44 is about 2 million years old. At this young age, brown dwarfs are warm and appear reddish in color. With age, they grow cooler and darker.

Image Credit: NASA/JPL-Caltech/T. Pyle (SSC)

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