Astronomers: Meteor Caused Calif., Nevada Explosion

No need to panic: That loud explosion heard early yesterday morning around large parts of California and Nevada? It was likely just a ... meteor, say astronomers. The mysterious explosion rattled windows and shook houses from Sacramento to Reno, causing residents throughout the region to phone police. Some people also reported seeing a fireball right around 8am. One astronomer tells the AP that the meteor likely broke up somewhere over the Sierra southwest of Reno. (More meteor stories.)