Asteroids are asteroids, and comets are comets... except when they aren't Some asteroids appear to be in motion.
creating their cometary cousins' characteristic comae and even tails
Only a few dozen of these active asteroids are known to astronomers.
The asteroids you find could reveal information about the solar system's history.
Asteroids are quite basic. They are the remains of stillborn rocky planets, rich in carbon, iron, and other heavy elements.
They're a jumble of ices and looser, lighter materials that developed on the solar system's outskirts during its birth.
Comets become irritated when they get too close to the sun due to their lighter ingredients.
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