Largest Piece of Wisconsin Meteorite Found

UA meteorite curator Marvin Killgore has a 300-gram piece of the object that exploded over Wisconsin in April. People in southwestern Wisconsin and northern Iowa on April 14 witnessed a sonic boom and a fireball that briefly - and spectacularly - lit up the late evening sky.

It was the result of an ancient rock that ended its 4.5 billion year journey through the solar system in a ball of flames entering Earth's atmosphere.

NASA officials estimated that the rock, a meteoroid some 3.3 feet across, blew apart with the force equivalent to 20 tons of TNT. Videos of it are widely available on the Internet.…