http://www.newsweek.com/small-planet-strips-earth-sized-world-atmosphere-collision-hd-172555-alma-1641213 > Astronomers have spotted the evidence of a massive planetary collision in a nearby star system for the first time. > The collision is believed to have occurred between an infant planet roughly the same size as Earth and a smaller body around the star HD 172555, which is 95 light-years away from Earth.