Discovery of the moon Deimos Moons are rare in the inner solar system. Neither Mercury nor Venus has a moon, and Earth, of course, has just one permanent natural satellite (though it sometimes ...
14.61 x 12.36 in. (37.1 x 31.4 cm.) ...
It's just half the size of Earth, with barely a third of its mass. Even the Martian moons Phobos and Deimos are petite, measuring just a few kilometers in diameter. Scientists aren't even sure how ...
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