| A | B |
|---|
| MARIE | measures radiation |
| THEMIS | looks for mineral distribution |
| GRS | measures elements on the surface |
| cosmic rays | from our sun and other stars |
| natrually radioactive | potassium uranium and thorium |
| thermal and epithermal neutrons | cosmic radiation by-product |
| lunar prospector mission | detailed water on the moon |
| "fingerprints" of atoms | emission and absorption lines |
| most of the soil-enriched hydrogen | Martian polar regions: GRS |
| martian weather | includes mostly dust-storm activity |
