A team of astronomers with the Transatlantic Exoplanet Survey today announce discovery of TrES-4, a new extrasolar planet in the constellation Hercules. According to lead author Georgi Mandushev of Lowell Observatory, TrES-4 is the largest known exoplanet. It is 70 percent bigger than Jupiter with an extremely low density. The new planet, first noticed by the PSST at Lowell Observatory also has an unusual subgiant host star.
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