US:Scientists have discovered the universe's largest known planet, a giant ball made of mostly hydrogen that is 20 times larger than Earth and circling a star 1,400 light years away.
Scientists believe the planet is 1.7 times the diameter of Jupiter, the largest planet in our solar system, and has a temperature of 1,260 degrees.
"There is probably not a really firm surface anywhere on the planet. You would sink into it," said Georgi Mandushev, a research scientist at Lowell Observatory in Arizona, and lead author of an article announcing the finding in the Astrophysical Journal Letters.
Lowell, along with the California Institute of Technology's Palomar Observatory and telescopes in Spain's Canary Islands, discovered the planet circling a star in the constellation Hercules. Scientists first spotted the new planet, called TrES-4, last spring. "It's just letting us know that nature has some surprises for us . . . a much wider range of possibility than we could imagine," said Alan Boss at the Carnegie Institution of Washington.
He said scientists "can't understand why these so-called fluffy planets are so fluffy. It really is a mystery, just how they can be so low-density." - ( AP)