Physics & Astronomy
craters
100%
ridges
87%
regolith
53%
slopes
37%
rims
29%
ejecta
29%
escarpments
24%
impact melts
24%
Lunar Reconnaissance Orbiter
22%
Lunar Orbiter
22%
laser altimeters
20%
pixels
20%
signatures
20%
illumination
18%
blankets
14%
hazards
13%
line of sight
12%
travel
12%
safety
12%
poles
11%
rays
10%
fragments
10%
sampling
10%
textures
10%
occurrences
10%
cameras
9%
statistics
9%
high resolution
7%
Earth & Environmental Sciences
crater
84%
science
57%
regolith
42%
ejecta
29%
pixel
19%
elephant
14%
slope angle
14%
altimeter
13%
hazard assessment
13%
mosaic
12%
travel
11%
pond
10%
texture
9%
laser
9%
melt
9%
safety
8%
statistics
8%
degradation
8%
detection
7%
sampling
7%
basin
6%
material
5%
parameter
4%