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<blockquote data-quote="helium3" data-source="post: 3393161" data-attributes="member: 31301"><p>A lower mass planet orbiting around our sun at the same distance as Earth and with the same atmospheric composition would be cooler (perhaps significantly) than our own world. The lower mass of planet means a thinner atmosphere, which means that it doesn't trap heat as well as ours. To compensate, you'd need to move the planet closer to the sun or assume that there's a higher proportion of "greenhouse" gases in the atmosphere to compensate. One solution would result in a shorter "year" than our own and the other would maybe cause a change in the color of the sky or the types of lifeforms that are best suited to the environment. You could deal with the shortened year problem by increasing the rate at which the planet rotates. Essentially, their day is objectively shorter than ours but it's not like anyone notices since there's no other reference point. </p><p></p><p>Or you could assume that the core consists of molten adamantium or some other imaginary hyperdense material.</p><p></p><p>Lower gravity isn't such a big deal, since again, it's not like anyone native to that world knows anything is wrong. A lower gravity world would objectively have a greater amount of vertical relief between features, since the driving force for smoothing everything else out isn't quite as strong as it is on our world.</p></blockquote><p></p>
[QUOTE="helium3, post: 3393161, member: 31301"] A lower mass planet orbiting around our sun at the same distance as Earth and with the same atmospheric composition would be cooler (perhaps significantly) than our own world. The lower mass of planet means a thinner atmosphere, which means that it doesn't trap heat as well as ours. To compensate, you'd need to move the planet closer to the sun or assume that there's a higher proportion of "greenhouse" gases in the atmosphere to compensate. One solution would result in a shorter "year" than our own and the other would maybe cause a change in the color of the sky or the types of lifeforms that are best suited to the environment. You could deal with the shortened year problem by increasing the rate at which the planet rotates. Essentially, their day is objectively shorter than ours but it's not like anyone notices since there's no other reference point. Or you could assume that the core consists of molten adamantium or some other imaginary hyperdense material. Lower gravity isn't such a big deal, since again, it's not like anyone native to that world knows anything is wrong. A lower gravity world would objectively have a greater amount of vertical relief between features, since the driving force for smoothing everything else out isn't quite as strong as it is on our world. [/QUOTE]
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