An ET who can not phone home.
The Solar longitude is 339.13 for this picture. Southern Summer (Where this picture was taken) begins at 270° and ends at 0°. So this picture was taken in the summer time.
That is not a shadow, light or dark (Yes I understand the pixel darkening. I have seen this in many Mars pictures. When this happens, you see black wherever there is shadow. That crater shadow should be black too if this was the case). The Sun is almost directly overhead. There should be almost no shadow, even a light one.