I WONDER - Is The Universe Flat?

The video explains that the universe expands in all directions without curving, making it flat. Unlike the Earth, which is round as confirmed by space exploration, the universe has zero curvature, meaning it is neither positively nor negatively curved, resulting in a flat geometry.

What does the expansion of the universe imply about its curvature?

What were the historical speculations about the shape of the Earth?

How has space exploration contributed to our understanding of the Earth's shape?

What does it mean for the universe to have zero curvature?

Explain the concept of positive and negative curvature in relation to the universe.