A documentary shown on BBC tv channel 4 last night and available on youtube in 15 minute segments-
http://www.youtube.com/watch?v=S1ptWBYDHsg
As depicted if one of these (or a meteorite or comet fragment) hits the earth there may be little or no warning (The sequence where a asteroid was found just 24 hours before it hit Africa near the Sahara).
http://www.youtube.com/watch?v=S1ptWBYDHsg
As depicted if one of these (or a meteorite or comet fragment) hits the earth there may be little or no warning (The sequence where a asteroid was found just 24 hours before it hit Africa near the Sahara).
