largest planet ever discovered
The planet, dubbed HAT-P-1, is located some 450 light-years from Earth in the constellation Lacerta. It is the largest planet ever discovered and boasts a radius nearly 1.4 times larger than Jupiter's. HAT-P-1 is also the least dense of all known planets. This planet is about one quarter the density of water, said Gaspar Bakos, a Hubble fellow at CfA. In other words, it's lighter than a giant ball of cork.