Asteroid security

How Big Are Those Killer Asteroids? A Critic Says NASA Doesn’t Know.

More than 14,000 known asteroids zip through Earth’s neighborhood. They will all miss Earth in the coming decades.

But hundreds of thousands more have not yet been discovered, and whether any of those are on course to slam into our planet, no one knows. So finding and tracking all the asteroids that could cross Earth’s path would allow officials to issue warnings and potentially provide time to deflect dangerous ones.

The community of scientists contemplating such doomsday possibilities is small and usually cordial — at least until Nathan P. Myhrvold barged in. Once the chief technologist at Microsoft, Dr. Myhrvold moved on to other endeavors like a six-volume, 2,438-page compendium of cooking knowledge that has been celebrated by chefs. (A sequel, about baking, is in the works.)