SpaceCannibal stars explode violently – as predicted by Darwin's son We now think one star swallowing another causes rare, bright red novae, but George Darwin had worked out the key details in the 19th century News
SpaceOur galaxy's impossible collision could break gravity The ballistics of galactic shrapnel show that the Milky Way has already crashed into its giant neighbour, Andromeda – but if that's right, physics is wrong Features