I believe that the only way to significantly change the orbit of a planet is to have it interact…
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What Effect Would the Removal of Saturn Have on the Rest of the Solar System?
I believe that this question has been answered very well on Physics Stack Exchange. The bottom-line is that Saturn’s…

What Color Would the Ocean Be on a Planet Orbiting a Red Dwarf Star?
The ocean on Earth gets its blue color due to the fact that it absorbs light from the red…

How Does Light From Distant Stars Remain Coherent?
Since the light from a distant star is a point source for any measurement that we want to make,…

How to Compute the Distance Between Two Stars
This is actually an application of spherical trigonometry. A good description of this calculation, including an online tool to…

Can a Moon Alternately Orbit Two Planets?
I don’t believe that the scenario you describe, were a moon is effectively shared by two planets in a…