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发帖数: 1994 | 1 Martian Moon Phobos from MGS
Credit: Malin Space Science Systems, MGS, JPL, NASA
Explanation: Why is Phobos so dark? Phobos, the largest and innermost of two Martian
moons, is the darkest moon in the entire Solar System. Its unusual orbit and color indicate
that it may be a captured asteroid composed of a mixture of ice and dark rock. The above
picture was captured recently by the robot spacecraft Mars Global Surveyor (MGS) orbiting
Mars. Phobos is a heavily cratered and barren moon, |
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