 L. Cook / Gemini Obs. / NASA / ESA / STScI |
An artist’s conception shows the binary system 2M J044144, with a primary brown dwarf surrounded by a disk as well as a planet-sized companion. |
If a gas giant forms like a star, but ends up small enough to be a planet, what do you call it? Astronomers are scratching their heads over a planet classification puzzle that is way bigger than Pluto.
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