This is rather related to the subject, thought I'd post it here instead of making a new topic. Since stars aren't accelerating up (they're accelerating away in all directions, which rules out UA as the cause), that means that all stars must have very nearly or exactly the same mass as our sun, moon, and the Earth, right? Because if they had more or less mass, they would accelerate more or less, and they would fall behind us or accelerate ahead of us at a faster rate then us(assuming I stayed awake in physics [I did]). What, exactly, ARE stars then, that can cause supernovae visible from Earth with the naked eye, but that are extremely close or equal to the mass of our sun?