3 upvotes, 1 direct replies (showing 1)
View submission: Ask Anything Wednesday - Physics, Astronomy, Earth and Planetary Science
A star or supernova of known brightness. Basically based on characteristics we can tell what type of thing it is and that this is always a certain brightness and then we can go well if it should be this bright at whatever distance then the fact that it's only this bright means it's this far away
Comment by ThoughtCenter87 at 20/07/2022 at 22:36 UTC
0 upvotes, 0 direct replies
Thank you!