Astronomers find super fluffy planet, fashionistas pack bags

WASHINGTON (AP) - The largest planet ever found orbiting another star is so puffy it would float on water, astronomers said Thursday.

The newly discovered planet, dubbed HAT-P-1, is both the largest and least dense of the nearly 200 worlds astronomers have found outside our own solar system. HAT-P-1 orbits one of a pair of stars in the constellation Lacerta, about 450 light-years from Earth.

"This new planet, if you could imagine putting it in a cosmic water glass, it would float," said Robert Noyes, a research astrophysicist with the Smithsonian Astrophysical Observatory.

The planet, a gas giant, is probably a puffed up ball of hydrogen and helium.