Scientists Discover Largest-Known Planet

Scientists have discovered the universe's largest known planet, a giant ball made of mostly hydrogen that circles a star 1,400 light-years away. Scientists believe the planet is about twice the size of Jupiter, and has a temperature of 2,300-degrees. Lowell Observatory along with the California Institute of Technology's Palomar Observatory in San Diego County and telescopes operating in Spain's Canary Islands, discovered the planet circling a star in the constellation Hercules. Scientists first spotted the new planet, called TrES-4, and a smaller one in spring 2006. Scientists at Caltech, Harvard University and the W.M. Keck Observatory in Hawaii later confirmed the discovery.

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