Oh it’s our solar system and all of the actual physical material that is in and around us.
Beyond the Oort cloud? Well, I don’t know. But at least this much we seem to know for sure and it’s pretty significant.
About 13 years ago, I designed a scientific nature religion around this. I didn’t go anywhere with it but I figured if there’s anything that one can verifiably be grateful to that is tangible, in us, around us and through us, it’s the sacrificial primal star and giant molecular gas cloud, our parents.