Boulder trails are common to the interior of Menelaus crater as
materials erode from higher topography and roll toward the
crater floor. Downhill is to the left, image width is 500 m,
LROC NAC M139802338L [NASA/GSFC/Arizona State University]. Most
boulder trails are relatively high reflectance, but running
through the center of this image is a lower reflectance trail.
This trail is smaller than the others, and its features may be
influenced by factors such as mass of the boulder, boulder speed
as it traveled downhill, and elevation from which the boulder
originated. For example, is the boulder trail less distinct than
the others because the boulder was smaller? What about the
spacing of boulder tracks? The spacing of bounce-marks along
boulder trails may say something about boulder mass and boulder
speed. But why is this boulder trail low reflectance when all of
the surrounding trails are higher reflectance? Perhaps this
boulder trail is lower reflectance because the boulder gently
bounced as it traveled down