This is due to two things. The Earth’s orbit around the Sun is elliptical, rather than circular, and the…
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Where Does the Energy Loss Due to Redshift Go in an Expanding Universe?
Let me refer you to an Ask Ethan blog post which provides an excellent detailed answer to your question. …

Can a Moon Orbit a Planet Near its South Pole?
In principle, yes, but such an orbit would not be very stable. Objects that orbit other objects settle into…

Can One Detect Meteor Scatter and Solar Storms with an AM/FM/Shortwave Radio?
I think that it would be difficult to detect meteor scatter or solar storms with an AM/FM/shortwave radio for…

Response to Gravitational Forces When the Speed of Gravity is Equal to the Speed of Light
Note that the theory of special relativity predicts that the constant c is not just a description of the…

A Question About Space Turbulence
I think that you are referring to the computer simulation results that were done a few years ago which…