How big can a planet be? Hopkins astrophysicist chases the answer
You can know a planet not just by its size, but also by the company it keeps
A planet can be no bigger than about 10 times the mass of Jupiter, an astrophysicist has concluded.
Of course, that's pretty darned massive. Jupiter carries almost 318 times the mass of Earth, making the most massive planets possible the equivalent of nearly 3,200 Earths.
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