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 n.— «He proposes a natural upper limit for a “planetary mass object” of about 13 times the mass of Jupiter, or about 4,000 Earths.…Because anything bigger, including stars and brown dwarfs, is able to fuse deuterium, Basri argues that it makes sense to define a “planetary mass object”—or planemo, as he has dubbed them—as an object too small to achieve any fusion. A natural lower limit to the mass of a planemo, Basri says, would be a body large enough for self-gravity to squash it into a round shape.» —“An orb by any other name” by Robert Sanders in University of California, Berkeley UC Berkeley News Feb. 26, 2003. (source: Double-Tongued Dictionary)

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Further reading

JuMBOS, Jupiter Mass Binary Objects

Astronomers have spotted nearly 150 objects far out in space that are too small to be called stars, but they can’t be called planets, because they don’t orbit a star. They’re about the size of Jupiter, but given what we know about...