Astronomers in US have found the fastest 'unbound ' star in the galaxy . Called Hawaii 708 it is moving at 745 miles ( 1,200km ) per second . It will leave the galaxy in about 25 million years . The star was given its rapid speed due to its companion going supernova . It is the first star found to be leaving the galaxy caused by such an event .
Astronomers in Hawaii have found the fastest 'unbound ' star in the galaxy . Called US 708 it is moving at 745 miles ( 1,200km ) per second . It will leave the galaxy in about 25 million years . The star was given its rapid speed due to its companion going supernova . It is the first star found to be leaving the galaxy caused by such an event .