Simon Goodwin, an astrophysics expert from Britain’s University of Sheffield, said that roughly 1,000 to 10,000 tonnes of material rained down from space towards the earth every day, but most burned up in the atmosphere.
“While events this big are rare, an impact that could cause damage and death could happen every century or so. Unfortunately there is absolutely nothing we can do to stop impacts.”
The meteor struck just as an asteroid known as 2012 DA14, about 46 metres (yards) in diameter, was due to pass closer to Earth - at a distance of 27,520 km (17,100 miles) - than any other known object of its size since scientists began routinely monitoring asteroids about 15 years ago.
(Additional reporting by Gabriela Baczynska in Moscow; Writing by Timothy Heritage and Thomas Grove; Editing by Mark Heinrich)