Physics & Astronomy
frost
100%
mars
83%
gamma ray spectrometers
74%
carbon dioxide
72%
atmospheres
39%
2001 Mars Odyssey
29%
regolith
19%
neutron spectrometers
18%
neutron counters
16%
sublimation
15%
caps
14%
ice
13%
poles
12%
time measurement
11%
attenuation
10%
gamma rays
10%
cycles
9%
hydrogen
8%
predictions
7%
Earth & Environmental Sciences
frost
73%
gamma radiation
71%
Mars
65%
spectrometer
59%
carbon dioxide
55%
atmosphere
33%
distribution
25%
sublimate
21%
sublimation
16%
regolith
15%
research center
14%
general circulation model
13%
detector
12%
hydrogen
10%
ice
9%
prediction
7%
energy
6%
Agriculture & Biology
frost
77%
spectrometers
56%
carbon dioxide
55%
gamma radiation
49%
neutrons
25%
regolith
17%
General Circulation Models
16%
sublimation
14%
detectors
10%
ice
10%
hydrogen
9%
prediction
6%
energy
5%
Chemical Compounds
Gamma Ray
77%
Carbon Dioxide
55%
Neutron
28%
Sublimation
16%
Column Like Crystal
8%
Hydrogen
7%
Energy
6%
Amount
6%
Time
5%