I believe that you can use the principle of similar triangles to solve this problem. Let D_sun be the…
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What would seasons be like on a Tatooine-like planet?
A Tatooine-like planet, or a planet that orbits a binary star system, would very likely orbit at a relatively…

Does the Earth’s Atmosphere Affect Radio Astronomical Measurements?
To varying degrees radio astronomical measurements are affected by the Earth’s atmosphere, including changes in water vapor content. These…

Mars Retrograde Motion
I believe what you are seeing is the apparent “retrograde”, or backwards, motion of Mars as the Earth overtakes…

What is “OII”?
“OII” is singly-ionized oxygen, in what is called spectroscopic notation.

Does Jupiter’s “Great Blue Spot” Produce an Aurora?
I have not been able to find any evidence of observed auroral phenomena associated with Jupiter’s “Great Blue Spot”. …