A new survey revises down the likelihood of a massive asteroid hitting the Earth by 20-30%. We're only due to collide with rocks larger than one kilometre across roughly once every 600,000 years, it concludes.
Free data from a global array of microphones could spot nuclear false alarms, averting disastrous retaliation, say scientists and defence experts. The ground-based network will detect the faint, low-frequency rumbles of meteor explosions high in the atmosphere that can look like nuclear explosions to other sensors.
Scientists representing the world's spacefaring nations have settled on plans to prevent the final frontier from filling up with man-made junk. Moving at thousands of kilometres per hour, even tiny pieces of orbiting debris are a threat to satellites, space probes and manned missions.