There's a computer connected to a satellite that is scanning the sky 24/7 which analyzes all of its data. By comparing previous images to current images, it can detect motion of asteroids. It reports data to real humans, so it can be verified and recorded. Because of this, most of the newest objects found in space are from this computer (I can't remember it's name) and it has been very difficult for astronomers to find anything that hasn't arleady been found by this computer.
I think with a bit more processing power, and some more satellites, we can eliminate the threat of a meteor hitting us without warning.
All that is left is to decide how to deflect the thing when a dangerous one is found.
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