Clusters of asteroids such as the Apollos have orbits that intersect Earth's orbit;there are more than a thousand mountain-sized Apollo asteroids that could hit the Earth.

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Apollo asteroids have orbits that cross Earth's orbit, which means they have the potential to collide with Earth. There are currently more than a thousand known Apollo asteroids that are considered potentially hazardous.

Clusters of Asteroids Such as the Apollos Have Orbits That