Asteroid Day
Well that was an interesting talk. There have been no massive asteroid impacts in living memory, so it’s easy to forget that they exist. The scientists are pretty confident they’re tracking 96% everything over a kilometre in diameter. Those happen just once every 700,000 years, which is good because they hit with the equivalent of 60,000 million tons of TNT. The worry is the smaller ones. A 40m-wide asteroid…