Jupiter Is Bigger Than Some Stars, So Why Didn’t We Get a Second Sun? – ScienceAlert

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.
In our Solar System, there are two objects larger than this teeny star. One is the Sun, obviously. The other is Jupiter,…

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