What existed before the Big Bang, and what will happen after the Big Rip?

Friends, we have returned after a long break and have accumulated many questions from our readers.

What was before the Big Bang? That is, where did that point, which exploded, come from?

Regarding what was before the Big Bang and whether there was anything at all, there are many theories, with two main ones:

• Before our Universe, there were others, and ours was born from their remnants;
• Our Universe is the first and appeared in…