An Unprecedented Space Collision

When two satellites crashed in space Wednesday, it was unprecedented -- the largest orbital collision yet -- but it wasn't exactly unexpected. "We knew this was going to happen eventually and this is it -- this was the big one," said Nicholas Johnson, chief scientist at the Orbital Debris Office at NASA's Johnson Space Center. When the two large satellites crossing paths at hypervelocity -- each weighing more than 1,000 pounds and going 17,500 miles an hour -- collided Wednesday over Siberia...Full Story