The bus-sized asteroid known as 2024 PT5 may be a huge boulder that broke from the moon after another space rock crashed into it centuries ago, astronomers say.
Currently 2m miles from Earth, about nine times farther than the distance to the moon, the asteroid never quite came close enough to be captured by the planet's gravity.
But its farewell pass will bring it as close as 1.1m miles in January for a final look before the sun's gravitational pull hauls it deeper into space.
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