Why Didn't Jupiter Become Our Second Sun?

The smallest known main-sequence star in the Milky Way galaxy is a real pixie of a thing.

It's called EBLM J0555-57Ab, a red dwarf 600 light-years away. With a mean radius of around 59,000 kilometres, it's just a smidge bigger than Saturn. That makes it the tiniest known star to support hydrogen fusion in its core, the process that keeps stars burning until they run out of fuel.

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