"If you work out the mathematics, the odds of a 1-kilogram- rock (2.2 lbs.) passing within some 30 feet (9.1 meters) of a person on Earth's surface within 10 minutes is about 1 in 500 billion," Bill Cooke of NASA's Meteoroid Environment Office told Space.com. "You have a 1,000 times greater chance of winning the Powerball lottery."
***
UPDATE: Over at Slate,
Phil "Bad Astronmy" Plait wrote, "It is entirely possible that what the
video shows is a smaller rock that fell out of the skydiver’s
parachute."
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