Basically, this thread is just about (basic) Astrophysical theory because the Math is quite simple. I am attaching a set of word problems and all I am asking for is to get feedback on whether or not I am correct or not about the formulas I am planning to use for each question. If I am wrong about one of my choices of formulas, it would be appreciated if you could explain why I am wrong and provide me the correct formula as well as the related background theory. I'm most uncertain about the last question (#3). I think I know what Very Long Baseline Interferometry is in theory but, to apply the math, is it the same formula as #2? Is a baseline analogous to a diameter of a telescope from #2? Are baselines the distances between the antennas? Are antennas telescopes in this context? (I am a bit confused about that part). Also, I am not asking for you guys to solve my problem(s) but you can if you want to :tongue:. Thanks in advance!