Washington: Astronomers using the US Kepler Space Telescope said on Monday they have found the largest planet yet discovered that orbits a pair of binary stars.

The new planet, Kepler-1647b, is 3,700 light-years away and about 4.4 billion years old, roughly the same age as the Earth, according to a team led by researchers from the US space agency NASA's Goddard Space Flight Centre and San Diego State University (SDSU).