November 10, 2005
NASA scientists have come up with a surprisingly simple yet effective way to deflect an Earth-bound asteroid: park a large spacecraft close by and let gravity do the work, creating an invisible towline to tug the rock off its deadly course.
The strategy crucially relies on our ability to detect an asteroid threat about 20 years in advance. For larger asteroids this is realistic. But Erik Asphaug, a planetary… read more