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Credit: David A. Aguilar (CfA)
March 9, 2016
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Artist's rendering of planet
Credit: David A. Aguilar (CfA)

The newly discovered world HAT-P-1 has baffled astronomers, since it is puffed up much larger than theory predicts. HAT-P-1 has a radius about 1.38 times Jupiter's but contains only half Jupiter's mass.