A minor nitpick. The comets and asteroids are worthy of study, but they weren't formed at the big bang (except in the trivial sense that all matter in the unive

A minor nitpick. The comets and asteroids are worthy of study, but they weren't formed at the big bang (except in the trivial sense that all matter in the universe came into existence then). The comets and asteroids in our solar system were created at some point after the solar system accreted out of a molecular gas cloud 4.5 billion years ago. At such they contain lots of evidence about conditions in the primordial solar system. But the universe itself is about 13.5 billion years old and none of the structures in the solar system (including the comets and asteroids themselves) existed at the big bang.