Just a guess, solar wind and light pressure makes tails, just like the tails of a comet.tech99 said:
The asteroid Dimorphos leaves a trail after impact because of the intense heat and pressure generated during its collision with another object. This heat and pressure cause the asteroid's surface to melt and vaporize, leaving behind a trail of debris and gases.
The duration of the trail left by Dimorphos' impact depends on several factors, such as the size and speed of the asteroid, the composition of the impacted surface, and the atmospheric conditions. In some cases, the trail may dissipate quickly, while in others, it may linger for days or even weeks.
No, the trail left by Dimorphos' impact will not affect Earth. The asteroid is currently on a trajectory that will take it near Earth, but not close enough to cause any harm. Additionally, the trail is made up of debris and gases that will dissipate in space and not reach Earth's atmosphere.
It is unlikely that the trail from Dimorphos' impact can be seen from Earth. The asteroid is relatively small, and its impact will likely occur in a remote area of space. Even if the trail is visible, it may be too faint to be seen with the naked eye.
The trail left by Dimorphos' impact can provide valuable information about the composition and structure of both the asteroid and the impacted object. Scientists can study the debris and gases to learn more about the materials present in these bodies and how they react under extreme conditions. This information can help us better understand the formation and evolution of our solar system.