Why does the asteroid Dimorphos leave a trail after impact?

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    Asteroid Impact
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tech99
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TL;DR
Dimorphos seems to be leaving a trail of debris after the spacecraft impact. But why should the debris be left behind?
Pictures have appeared showing the asteroid Dimorphos following its impact with a spacecraft and showing a trail being left behind. On further consideration, this is taking place in a vacuum, so there is no air resistance. Why is the debris forming a trail behind the asteroid?
 

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tech99 said:
Why is the debris forming a trail behind the asteroid?
Just a guess, solar wind and light pressure makes tails, just like the tails of a comet.

Annotated greyscale photo of a comet with a bright head and two tails spreading upward: a gas tail on the left and a dust tail on the right. Labels read "Gas tail", "Dust tail", "Dust trail" and "Sun", with arrows showing the sun's direction.