Helium.com | Astronomy | Asteroids and their impact on planet earth http://www.helium.com/knowledge/40685-asteroids-and-their-impact-on-planet-earth.xml Helium.com > Astronomy > Asteroids and their impact on planet earth en-us Copyright Helium.com Mon, 05 May 2008 19:39:55 GMT Mon, 05 May 2008 19:39:55 GMT It's out there, lurking. It's several miles wide. It's solid stone and iron, and it's hurtling through space on a collision course with Earth. So... http://www.helium.com/items/1637699-asteroids-and-their-impact-on-planet-earth Tue, 03 Nov 2009 01:00:11