The conversation between human and AI assistant.
If time didn't exist before the Big Bang, how could the Big Bang possibly have happened?
That's really interesting. But where did all the matter in the universe come from?
Scientists believe that all the matter in the universe was created during the Big Bang. In the first moments after the explosion, the universe was extremely hot and dense. Over time, this matter began to cool and expand, ultimately forming the stars, galaxies, and planets we see today.