...and what form may they found normally? Somebody asked me just how many of the particles we know are possible (say, delta baryons) can be found in nature and what is their usual state - are there many particles to be found outside of atoms? Although there are enough "abundance of elements" type articles they only address things on the atomic level when baryonic matter is already forming chemical elements. I found no sources that would say for example, how common different types of fermions are and where would you expect them to occur. I suspect it could be the wrong type of question as we know that elementary particles mostly arise due to complex field interactions, and yet at the same time, I feel that questions like, "how are these created" "in what kind of places (from a human POV) would they form" "would they exist in isolation from other particles" seem valid. I expect that the answer would be something like particles being birthed in stars, and then (presumably) going on to exist thorough space, limited by how easily some find and react with each other, but can anybody provide some more specific information and source on that?