“Some are very small − below 10 m diameter − and only a tiny fraction of the estimated population of these have been discovered, but any impact would be harmless.
“The main challenge stems from the population of middle-size objects, ranging from tens to hundreds of metres in diameter.
“There are a lot of these asteroids, and most have not been spotted yet. Any impact from one of these could really do damage to a city or a populated area.”
Thankfully, even at its closest, Asteroid AA10 will miss the Earth by more than one million miles.
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