[ETL]

I don't buy the explanation for the grooves. We see similar grooves on plenty of other low gravity bodies in the solar system. My theory is still low angle low speed impacts that roll along the surface.

Roll marks in what? The regolith? Does it even have such loose material on its surface?

[cripplecreek]

I suspect there is a lot of loose dust. Another possibility is lines of impacts from groups of small meteorites gravitationaly bound together.

A photo of the Vesta asteroid shows the same type of grooves.

[American in Israel]

In the third shot down you can see a stone sitting at the end of a groove as if it rolled to a stop. I do believe he is right.