For the first time astronomers have detected the last gasps of a star being torn apart by a previously dormant giant black hole.

The signals, which came from a galaxy 3.9 billion light years away, were x-rays generated by matter heated to millions of degrees and torn apart as material from the star crosses the black hole's event horizon.

German scientists have developed a sturdy material called Aerographite made mostly of air, opening up huge implications for the future development of electronics.