An old picture, taken with old film, with obvious gradients in slope and ground texture? Plus, the astronaut shadow doesn't seem to extend on the downward slope like the other long shadow. Plus it appears too dark as if no ambient light is touching any ground mass where the shadow is cast.

Your picture looks photoshopped to me. =P

EDIT : Based on that downward slope alone, that astronaut looks like he would be 20ft tall