SpaceDid wobbly cosmic strings create huge explosions? Cosmic strings – imperfections in space-time – may be to blame for two unusual bursts of gamma rays in the early universe 51¶¯Âþ
SpaceRoger Penrose: Non-stop cosmos, non-stop career The mathematician and self-proclaimed incurable optimist talks about his cameo in an Oscar-nominated movie and why he has no time for string theory Opinion