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Worldbuilding

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  • $\begingroup$ Are you specifically talking about Earth and its moon? What do you count as "gravity makes its toll" and yes, its going to have something to do with the composition of the moon, density dictates your apparent size vs gravitational effect. $\endgroup$
    – Lio Elbammalf
    Commented Feb 9, 2018 at 15:56
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    $\begingroup$ I think that 'gravity takes its toll' is referring to either the Roche limit (too close) or to binary orbits (like pluto and Charon.) $\endgroup$
    – Jakob Lovern
    Commented Feb 9, 2018 at 16:09
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    $\begingroup$ This question might be better asked at Astronomy.SE or Physics.SE. However, you need to be a lot more specific. An object the size of a softball will be invisible until it's so deep inside the planet's gravity well that it will definitely fall to the ground. On the other hand, living on a gas giant moon will result in the gas giant periodically filling the entire sky. So, you must either (a) specify the size of the object or (b) specify the amount of the sky you want to fill. Without specifying one of these, the question cannot be answered. $\endgroup$
    – JBH
    Commented Feb 9, 2018 at 16:10
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    $\begingroup$ You have not added the specifications. If you tell us the size of your moon, we can tell you how close it can orbit and, therefore, how much of the sky it will fill. If you tell us how much of the sky you want filled, we can tell you the size of the moon and orbit necessary to achieve that. Please pick one. $\endgroup$
    – JBH
    Commented Feb 9, 2018 at 16:20
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    $\begingroup$ @JBH Turns out you don't need specifics. I tried to solve it as a set of linear equations, but it turns out the units cancel beautifully. Who knew? Science is wonderful. $\endgroup$
    – kingledion
    Commented Feb 9, 2018 at 18:39