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A planet lighter than a ball of cork is one of the puffiest alien planets known to date. Called HAT-P-1, the planet is about half as massive as Jupiter but about 1.76 times wider-or 24 percent larger than predicted by theory. It could float in water, if there was a tub large enough to hold it. [Full Story]
Artist rendering of new finds in the universe
An artist rendering illustrates the newly discovered world (HAT-P-1) that has baffled astronomers, since the planet is much larger than theory predicts, scientists said September 14, 2006. HAT-P-1 has a radius about 1.38 times Jupiter's but contains only half Jupiter's mass.