They call them "NEO" and are the objects stray dangerously close to the ground. They are stones of various sizes that sometimes we fall on, and so it pays to keep an eye on in order to avoid unpleasant surprises.
Their quantity is inversely proportional to the size:
objects
about 10 meters in diameter are roughly 150 million
100 meters in diameter down to 320,000
500 meters, less than 10,000
1 km, 2,000 stones
2 km, 400 stones
10 km, 10 "Saxon", or rather let us say "mountains", or planets.
the margins of this scale there are also larger and sensitive. Those over 10 km
captain rarely, every several million years (and we should also see some time in advance, at present) and are the ones that cause climate change throughout the world for that raise dust into the atmosphere on impact. Items in the order of a meter in diameter also fell more than once a year. But never fear: the asteroids under 10 meters crumble on impact with the Earth's atmosphere, which is a good shield up to this size. To change the atmosphere then we must also assess the size of the asteroid, if it consists of metal is harder and better through the atmosphere, otherwise it crumbles and falls more easily. The asteroid that caused the Meteor Crater in Arizona (pictured) was a hundred feet wide (However, the crater is 1,200 meters).
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