SpaceTick tick boom, the Earth spits out a moon Did a nuclear time bomb deep inside the young Earth tear the planet apart? The evidence could be staring down at us every night, says Stuart ClarkFeatures
SpaceDust devils around stars may help planets grow A vortex seen in a disc around a young star may solve the mystery of how planets grow from grains of dust without first spiralling in to destruction 51¶¯Âþ