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An asteroid so big it pulled its own moon flew by Earth Friday afternoon. NASA called it a "potential city killer," and said it would pass within 3.6 million miles of Earth, roughly 15 times the distance between Earth and the moon.
The good news is, there will be no need to call on a rag-tag team of oil rig workers to save the day, or crank up the Aerosmith.
The bad news is there are actually space rocks the size of the Golden Gate Bridge floating around, and Earth may not always be outside of the danger zone when one comes hurtling this way.
CNN's Tom Foreman shows just how big and dangerous these asteroids can be in the video above.