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Thread: How Large Can A Planet Be?

  1. #1
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    How Large Can A Planet Be?

    When it comes to planets, the largest planet in the universe probably isn't the most massive.
    The post How Large Can A Planet Be? appeared first on Universe Today.


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  2. #2
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    Dec 2001
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    I believe I once read somewhere that Jupiter is near the limit for it's mass in relation to it's size, in that if it were a bit more massive it would actually be a good bit smaller due to higher gravity causing it to further compress.

  3. #3
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    Some hot Jupiters are significantly larger, because they have expanded due to their average temperature. If you were to cool such a hot planet down to the same temperature as Jupiter they would be about the same size as that planet. The planet Kepler 13Ab is one of the largest known worlds, about 2.2 x as wide as Jupiter with a mass about 9 times as great.

  4. #4
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    If we only consider rocky worlds, these also have a maximum radius, because above a certain mass the rock gets compressed in the same way that a gas giant does. For a rock-only world the maximum radius seems to be about 3.5 times the radius of Earth.
    http://aleph.se/andart2/megascale/wh...bitable-world/
    Curiously, this maximum radius seems to occur at about the same mass as Jupiter, roughly 300 Earth masses.

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