SCIENTIFIC DOCUMENTARY: Leading Edge
On: BBC Radio Four
Date: Thursday 5th November 2009 (starting in 2 hours and 5 minutes)
Time: 21:00 to 21:30 (30 minutes long)

Geoff Watts hears from meteorite hunters who scour the deserts of
Arizona and Australia and the ice of Canada and Antarctica to seek out
extra-terrestrial rocks. He meets those who analyse them, using traces
of rare elements to track their history and reveal their origins.