UArizona researchers ask: How did part of the moon become a near-Earth asteroid?

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UArizona researchers ask: How did part of the moon become a near-Earth asteroid?
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Justin Boggs is a writer for the E.W. Scripps company. Justin covers anything from politics to sports and entertainment.

Kamo'oalewa is an uncommon near-Earth asteroid that takes an odd path around the Earth and is expected to remain a companion of our planet for millions of years.

The researchers published their findings recently in the Nature journal Communications Earth and Environment. A previous study indicated that its composition was not like other near-Earth asteroids but was more like the moon's. The researchers believed it ejected from a meteoroid impact on the lunar surface.

What the researchers found, however, is that a small number of these fragments could end up in such orbits. Using simulations, the research says that about 93% of moon fragments from large meteoroid impacts would result in heliocentric orbits — ones that would cause the fragment to orbit the sun. But in 6.6% of simulations, fragments like Kamo'oalewa would take more horseshoe-like orbits, which could put them in quasi-satellite-like orbits.

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