| Term | Definition | Contributor | Modified |
|---|---|---|---|
| Mars_Reconnaissance_Orbiter | No definition provided | Ryan McGranaghan | 2023.04.16 |
| Marston Moor, Battle of, 1644 | No definition provided | Christopher Rauch | 2023.12.01 |
| Mars trojans | The family of asteroids located at either of the stable Lagrangian points (L4 or L5) of the orbit of Mars. | Ryan McGranaghan | 2023.04.16 |
| Marsturite | No definition provided | Ryan McGranaghan | 2023.04.16 |
| Marsupialia | No definition provided | Christopher Rauch | 2023.12.01 |
| Martens | No definition provided | Christopher Rauch | 2023.12.01 |
| Marthozite | No definition provided | Ryan McGranaghan | 2023.04.16 |
| Martial law | No definition provided | Christopher Rauch | 2023.12.01 |
| Martial law--U.S. | No definition provided | Christopher Rauch | 2023.12.01 |
| Martian satellites | No definition provided | Ryan McGranaghan | 2023.04.16 |
| Martian satellites | No definition provided | Ryan McGranaghan | 2023.04.16 |
| Martinique, Battle of, 1782 | No definition provided | Christopher Rauch | 2023.12.01 |
| Martinite | No definition provided | Ryan McGranaghan | 2023.04.16 |
| Martins | No definition provided | Christopher Rauch | 2023.12.01 |
| Martite | No definition provided | Ryan McGranaghan | 2023.04.16 |
| Martourite | No definition provided | Ryan McGranaghan | 2023.04.16 |
| Martyite | No definition provided | Ryan McGranaghan | 2023.04.16 |
| Martyrs | No definition provided | Christopher Rauch | 2023.12.01 |
| Martyrs--Bibl | No definition provided | Christopher Rauch | 2023.12.01 |
| Marumoite | No definition provided | Ryan McGranaghan | 2023.04.16 |