Bizarre X-shaped intruder linked to an unseen asteroid collision

Astronomers have observed what happens after asteroids crash together. Using Hubble to study the aftermath of one such collision over four months, they watched a strange, comet-like debris trail slowly evolve as the collision site orbited the Sun. This research gives clues about how asteroids behave when they collide, and how the fall-out from these impacts contributes to the dust that pervades the solar system.

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