You mean how to calculate luminosity-based feats? Like lighting up the galaxy or stuff like that? Way to start with the one thing I don't know that well lol Ages since I did one of those. Gonna orientate myself on this. If you want an easier time ya can really simply use that calculator. Anyway Step 1: Pick the appropriate apparent magnitude value from here. I.e. pick the value corresponding to the object that is as bright as what ya wanna calc. So, if something makes things as bright as day, then the apparent magnitude is as bright as the Sun when seen from Earth, which is −26.832. Step 2: Figure out how far your light source is away. So, if it is lighting up a galaxy that might be the galaxies radius. Let's take the Milky Way's for that: 13400 parsec. If the unit you find isn't in parsec already, convert it to such. Step 3: Plug the values into this formula 10^(( apparent magnitude + 5 - 5*log10 ( 13400 ))/-2.5) * 3.0128 * 10^28 So in our example 10^(( -26.832 + 5 - 5*log10 (...
