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The dark cratered satellites resemble captured carbonaceous asteroids. The figure is taken from NASA Science, which is linked in full on this page. Every fact on Mondo Knows names its source rather than repeating an unsourced claim.

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Mars has two tiny irregularly shaped moons named Phobos and Deimos

The dark cratered satellites resemble captured carbonaceous asteroids

Mars is orbited by two small, dark moons named Phobos and Deimos, discovered in 1877 by Asaph Hall. Phobos measures just 22 kilometres across while Deimos is only 12 kilometres wide, leading astronomers to believe both are former asteroids captured by Martian gravity.

Phobos over Mars' limb by HRSC — ESA/DLR/FU Berlin (G. Neukum) · CC BY-SA 3.0 igo · licence · source

Where this comes from

NASA Science

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Tags: mars, phobos, deimos

Mars has two tiny irregularly shaped moons named Phobos and Deimos: the short answers

Where does this come from, and can I check it?: The dark cratered satellites resemble captured carbonaceous asteroids. The figure is taken from NASA Science, which is linked in full on this page. Every fact on Mondo Knows names its source rather than repeating an unsourced claim.
Is this really a space fact?: Yes. It sits on the Space shelf, one of 1,090 sourced facts grouped into space, animals, the human body, history, science and more. Category pages collect every fact in the same field.
What else can I read about it?: The links under the fact point to a quiz, game, puzzle or calculator on the same subject, and the shelf below shows related facts. The wording here is original, and quoted phrases are marked as quotations.