SpaceMisbehaving pulsar's sudden slow-down may teach us how they tick A bright young pulsar that seemed to be stable has slammed on its brakes. Understanding this shift in behaviour could help astronomers calibrate cosmic clocks 51¶¯Âþ
TechnologyLaser beam warfare is here – but not as we expected Ronald Reagan imagined giant lasers in space shooting down Soviet missiles from afar. The reality has turned out to be mercifully modest, says Jeff HechtComment