What killed the dinosaurs? And should we be worried about going the same way? Astronomers regularly discover huge lumps of rock and ice hurtling past the Earth, and if some of them were to actually hit us then the effects could be terrifying, with dramatic consequences for all life on Earth. Recent near misses, and the huge airburst explosion over Chelyabinsk, Russia, in February 2013, make this a very topical issue. The European Space Agency’s Space Ambassador for Wales spins a tale of death, destruction and dinosaurs.
