Astronomers discover a planet - about six times bigger than Earth - whose skies are lit by four different suns, some 5,000 light-years away.
The distant world orbits one pair of stars which have a second stellar pair revolving around them. The discovery was made by volunteers using the Planethunters.org website along with a team from UK and US institutes; follow-up observations were made with the Keck Observatory. The planet has been named PH1 after the Planet Hunters site. It is thought to be a "gas giant" slightly larger than Neptune - more than six times the radius of the Earth.