| Phobos and Deimos are still largely unexplored despite many unanswered questions about their origin, composition, and structure. |
| Phobos-Grunt, Russian spacecraft that was designed to land on the Martian moon Phobos and bring some of its soil back to Earth. |
| Optech Inc. of Toronto, Ontario, will lead a team to develop a mission concept to explore Phobos, one of Mars' two moons. |
| Their Phobos-Grunt mission will be the first to land on this strange moon, and, with luck, it will return to Earth with samples of Phobos. |
| There is strong evidence that they are associated with the formation of the largest crater on Phobos. |
| One of the most striking features on the 27-km wide, irregularly-shaped Phobos is the presence of grooves over most of its surface. |
