Elevator Pitch - What Came Before the Big Bang?

The video explores the Big Bang theory, addressing common misconceptions and explaining the concept of singularity. It discusses scientific speculations about the universe's origins and future, including the Big Crunch and multiverse theories. The video highlights how scientists use existing theories to make educated guesses about unknown phenomena.

What are some theories mentioned that could explain the universe's expansion or collapse?

Why is it important for scientists to base their speculations on existing knowledge?