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The Moons of Mars Explained — Phobos & Deimos MM#2

Kurzgesagt – In a Nutshell | November 11, 2025



What do you know about the Moons of Mars? Nothing? They are super cool (and strange), promise.

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The Moons of Mars explained — Phobos & Deimos

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Written by Kurzgesagt – In a Nutshell

Comments

This post currently has 43 comments.

  1. @kurzgesagt

    November 11, 2025 at 4:05 pm

    You want to learn more about space? Check out our space products on the kurzgesagt shop – all designed with love and produced with care.
    Getting something from the kurzgesagt shop is the best way to support us and to keep our videos free for everyone.
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  2. @omaralkhatib3646

    November 11, 2025 at 4:05 pm

    Addition: Phobos and Deimos are so tiny that they don't even have enough gravity to stabilize Mars's tilt, the variations in Mars's axis causes extreme temperature variations that can occur rapidly, within less than a week, which results in frequent dust storms.

  3. @brucea9871

    November 11, 2025 at 4:05 pm

    The prevailing theory for many years of the origins of Mars' moons is that they are captured asteroids as you said. But lately I have heard another theory; that an asteroid (or comet) crashed into Mars, some material was ejected into space by the impact, and the ejected material became Mars' moons. This is plausible since that is how Earth's moon formed.

  4. @vladskiobi

    November 11, 2025 at 4:05 pm

    Compare the masses of all moons in the Solar System. Ganymede, Titan, Callisto, Io, our Moon, Europa and Triton are behemoths. They're staggeringly huge, way beyond the average size of a moon. Mars would feel almost negligible tidal effects from its diddy moons, whereas ours can lift oceans.

  5. @LindaStevensBZ

    November 11, 2025 at 4:05 pm

    Come on guys. You've got to do a better job with your proofreading and editing. Phobos is not falling out of orbit at 2 m per year, it's 2 meters per hundred years. A simple multiplication problem would tell you that your script was embarrassingly errant.

    Please pin a comment highlighting that error or redo the edit in your soundtrack.

  6. @whooshmeifgay2593

    November 11, 2025 at 4:05 pm

    Even though both are likely adopted, they are not loved equally. Phobos and Mars share a very deep emotional connection that’s bringing them closer and closer as time goes on. Meanwhile the neglected Deimos has been distancing itself from the other two, getting further and further away with each passing year. Sad so see Mars picked favourites… please don’t do this if you ever choose to adopt😢

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