If we want to be picky I'd say "Approximately one billion meteoroids enter the Earth's atmosphere daily" Meteors can't enter the atmosphere. They only exist in the atmosphere. It's the interplanetary dust or meteoroids which are in space. Malcolm To UNSUBSCRIBE from the 'meteorobs' email list, use the Web form at: http://www.tiacdot net/users/lewkaren/meteorobs/subscribe.html