Old and Cold

Look: NASA spots an unusual object in deep space

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NASA/JPL-Caltech

See this colorful sphere that looks a bit like Jupiter?

It’s not quite a star and not quite a planet: it’s a brown dwarf.

Brown dwarfs are bigger than planets but smaller than stars. They glow dully but lack nuclear fusion — the chemical process that causes stars to shine.

NASA/JPL-Caltech