The Trouble with Terrestrial Planets | Artifexian

When constructing terrestrial planets, a worldbuilder needs to work with three important variables: mass, radius and density.

Set those values correctly and the result with be a small rocky planet. Set them incorrectly and a terrestrial planet can come out looking more like Neptune than Earth. Or worse still, the planet will be utterly implausible.

Want to make sure your terrestrial planet is both rocky and plausible?

As always, Artifexian has you covered. Check out the video below.

…Edgar out!

  • John H Reiher Jr

    So where do Carbon planets fit into this graph?

    • michael pulleine

      they dont

      • John H Reiher Jr

        They don’t but we do have a candidate for one: 55 Cancri e.

        It’s about 8.6 Earth Masses with a radius of 2 Earth radii, and density of 5.9 g/cm. Earth density is about 5.5 g/cm, so it should have a surface gravity about 2G.

  • michael pulleine

    why cant we just say that they’re terrestrial and get on with the other details? please? mum? okay, I’m leaving…

  • Leonardo Faria

    An alternative being that the planet we detected in that little unknown corner of
    the galaxy “seems” to have, by careful instrumental probe, mass, radius and
    density “just like” Earth, thus “very likely” to have terrestrial characteristics. Quick gimmick to discharge in one shot the whole techie stuff.
    Okay,I know, if we want to sound the hard scifi tone we need all the planetary
    paraphernalia. From a video like this I think we could squeeze a good chapter
    of “show don’t tell” snippets to set the stage of the story.

  • michael pulleine

    i think ill stick to carbon based life-forms living on a planet where A due to G is 9.8 metres per second per second, sometimes its good to stick to what you know works!