Nayir1 t1_jbecdq9 wrote

As to the edit, what we mean by 'mouthwash' kind of matters. Like certain types of bacterial infection can be exacerbated by Listerine and the like, where cheap as dirt hydrogen peroxide or simple salt water can be beneficial.


Nayir1 t1_j2w3wrm wrote

Forget about accretion disks, that's a local phenomenon.You're right in the sense that galaxies exist because the Black hole at the center does not become massive enough to have all the matter. In the same sense that earth exists because of the sun because it the sun is not massive enough to have subsumed the earth. Also, nebulae are gas features within galaxies, but entire galaxies we're once called nebula before we realized they're just far away galaxies.