Yep. Cosmologists work at the largest scale and often simplify regular matter down to hydrogen (“gas”) and everything else (“metal”).
So if you ever see a reference to the “metallicity” of a star, that can include the presence of carbon, nitrogen, oxygen, etc… which chemists of course would never refer to as metals.
jamhandy@lemmy.ml 9 months ago
Pretty much, the universe is hydrogen, helium, and rounding errors.