Space Rocks' Demo Job: Asteroids, not comets, pummeled early Earth

9:52am, March 6, 2002

It's no secret that the inner solar system took a beating from swarms of speeding objects soon after the planets and moons formed. What's been uncertain is the nature of those extraterrestrial bullets. A new analysis of meteorites suggests that it was asteroids rather than comets that rained hell on Earth about 3.9 billion years ago.

This article is available only to subscribing members. Join SSP today or Log in.

Get Science News headlines by e-mail.

More from Science News