You may think of them as huge rocks hurtling through the sky, but the asteroids that helped create our planet may have started life as balls of mud, according to a new study.
Asteroids containing carbon, also known as carbonaceous or C-type asteroids, are the most common type in our solar system. They are believed to be the precursors to the terrestrial planets, but exactly how they formed is not fully understood.
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Abigail Beall 