Space experts this week warned of an Olympic swimming pool-sized space rock that - but how many more are out there?The good news is that it’s not time to head to the Doomsday bunkers yet - the Valentine’s Day asteroid (2023 DW) was rapidly given lower odds of hitting Earth.But there are several asteroids out there with the potential to hit Earth in the coming centuries - although space agencies around the world are keeping a close eye on these.
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