Astronomers find a new planet that s mostly made of iron gpb.org - get the latest breaking news, showbiz & celebrity photos, sport news & rumours, viral videos and top stories from gpb.org Daily Mail and Mail on Sunday newspapers.
Scientists have spotted one of the smallest planets ever discovered outside our solar system, a scorching-hot world a bit larger than Mars and just about as dense as pure iron zooming around its home star every eight hours.