via Mother Nature Network
Chelyabinsk analysis proves you really should be worried about asteroids
Predicting if and when these asteroids will collide with Earth will require new technologies, many of which are in development.
By Mike Wall, SPACE.com
The number of asteroids zooming close to Earth is far greater than previously believed, highlighting the need to ramp up efforts to find and track these potentially dangerous space rocks, experts say.
A new analysis of the Russian meteor explosion that injured more than 1,000 people in the city of Chelyabinsk this past February estimates that similar impacts occur about seven times more often than previously thought.
That means there could be more than 20 million near-Earth asteroids roughly 62 feet (19 meters) wide — the size of the Chelyabinsk object — rather than three or four million, scientists say, adding to the Russian meteor explosion's importance as a teachable moment.