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Stellar Companion Appears to be Giant Planet

APR 01, 1985
David Helfand

Is Jupiter as large as a planet can be? Are the Sun’s faint neighbors, with roughly 10% of its mass, the smallest stars? There is no apparent physical reason that objects in the mass range of 5 to 50 times the mass of Jupiter should not exist, and although the properties of such objects have not been well explored theoretically, their existence has important implications for a number of fields in physics and astronomy.

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Volume 38, Number 4

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