The Success of Spaceguard

For years, many scientists warned of the dangers that asteroids pose to life on Earth, but for many years they weren’t listened to. Even after it was first proposed, in 1980, that the dinosaurs were killed off by a huge asteroid striking the Yucatán Peninsula in Mexico,1 there was, in the words of leading astronomer Clark R. Chapman, a “giggle factor” associated with the risk from asteroids.2 This all changed in 1994 when comet Shoemaker-Levy 9 thudded into the side of Jupiter with th...