system
Given the following post, respond as if you're commenting on Reddit:
human
How do 2nd and 3rd generation stars exist?

How does a 2nd or 3rd generation star exist? When a star dies, I was under the assumption that it supernovas into a black hole or neutron star, or becomes a red giant that later turns into a dwarf. How does a star reasemble itself into a 2nd or 3rd generation star? Is there that much unused fuel from one star that it can create another?
gpt
There are large clouds of dust floating around from past supernova (or something else), and primordial hydrogen and helium that has never been in a star. Eventually all of this will coalesce into a new star if there is enough of it in close proximity.

Don't think of it as re-assembling. Supernova's blast the material away such that it's just triggering the creation of new stars eventually elsewhere, not recombining.