How do the properties of long-lived stars compare to those of short-lived stars?

If we will base our answer on Hertzsprung diagram, we will see that mass and luminosity are directly related, which means, long lived stars begin their lives with more mass and a larger amount of hydrogen fuel, hence hydrogen is abundant before than now. They are more luminous during their main sequence lives.  Giant stars and supergiant stars have great masses, so, they have greater luminosities.

 

Cpopulation density

Europe needs to build a trump-like wall that will spread across europe making it impossible for migrants to cross they need to spread pig guts all over this wall so the muslims will never consider crossing into europe..you might be asking "can't they just fly over with planes? " well yes they can so we will install thaad missile protections system to shoot down any aircraft that violates europe's air fourth would be to start a fourth reich in germany.. last but not least.. make europe great again!