gravity tractor

NASA: Asteroid flyby next week is the closest ever of its size

A close encounter of the rocky kind is set for Feb. 15, when an office-building-size asteroid will speed past Earth faster than a bullet and closer than some communications satellites. It will be the nearest recorded brush with a space rock so large, NASA scientists said...

Asteroid activists launch fund-raising campaign for space telescope

Leaders of the nonprofit B612 Foundation today took the wraps off a campaign to fund and launch a space telescope to hunt for potential killer asteroids — a campaign they portrayed as a cosmic civic improvement project. Former NASA astronaut Ed Lu, the foundation's chairman and CEO, estimated that...