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<blockquote data-quote="Grymar" data-source="post: 3369533" data-attributes="member: 41371">Using real world physics?&nbsp; That's a hard one to work out.The moon's gravity isn't strong enough to keep an atmosphere in place, and thus water will evaporate into space immediately.&nbsp; Mars, at about 2/3rds the size of Earth, is able to keep an atmosphere and probably at one time (and maybe even periodically today) had running water.&nbsp; Titan would probably be a good analogy...it has about twice the mass of our moon and is able to hold on to an atmosphere.Tides would be significantly stronger than what you would see here on Earth.&nbsp;&nbsp; And yes, the sun's position would make a difference, but there are a lot of questions you'd have to get into such as the orbital period of the moon and its rotational period, plus the primary planet's distance from its star.We do have two tides, a lunar tide and a solar tide, although the solar tide is weak enough that it is often ignored, so there would be an effect.HAVING SAID ALL OF THAT, think of a cool effect and do it.&nbsp; If your players break out orbital physics, then its time to beat them with the DM hammer.</blockquote>

[QUOTE="Grymar, post: 3369533, member: 41371"] Using real world physics? That's a hard one to work out. The moon's gravity isn't strong enough to keep an atmosphere in place, and thus water will evaporate into space immediately. Mars, at about 2/3rds the size of Earth, is able to keep an atmosphere and probably at one time (and maybe even periodically today) had running water. Titan would probably be a good analogy...it has about twice the mass of our moon and is able to hold on to an atmosphere. Tides would be significantly stronger than what you would see here on Earth. And yes, the sun's position would make a difference, but there are a lot of questions you'd have to get into such as the orbital period of the moon and its rotational period, plus the primary planet's distance from its star. We do have two tides, a lunar tide and a solar tide, although the solar tide is weak enough that it is often ignored, so there would be an effect. HAVING SAID ALL OF THAT, think of a cool effect and do it. If your players break out orbital physics, then its time to beat them with the DM hammer. [/QUOTE]

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