Small Companion to Brown Dwarf Challenges Simple Definition

Astronomers using Hubble and Gemini have discovered a planet-like object circling a brown dwarf. The companion is the right size for a planet (about 5-10 times Jupiter's mass). But the object formed in less than 1 million years (about the age of the brown dwarf) and much faster than the predicted time it takes to build planets according to some theories.

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