Solar Furnace Channels The Power Of The Sun, Melts Rock 1.03K Dan Grappone 11/24/10 09:58AM Filed to: Bang goes the theory Bang goes the theory Science Bbc TV tweet Video This clip from BBC One's Bang Goes The Theory shows us a high-powered solar furnace that can focus regular old sunshine into a heat ray, fiery to the touch. It reaches a spicy 3,500C, which can freaking melt rock.