The contrasted lines of a bootprint appear as Buzz Aldrin lifts his foot to record an image for studying the moon's soil properties. Apollo pictures show scores of clear bootprints left behind as the astronauts traipsed across the moon. (Find out more about moon exploration.)
You can tell Apollo was faked because ... the astronauts' prints are a bit too clear for being made on a bone-dry world. Prints that well defined could only have been made in wet sand.
The fact of the matter is ... that's nonsense, said Bad Astronomy's Plait. Moon dust, or regolith, is "like a finely ground powder. When you look at it under a microscope, it almost looks like volcanic ash. So when you step on it, it can compress very easily into the shape of a boot." And those shapes could stay pristine for a long while thanks to the airless vacuum on the moon.