These very strange universes could theoretically be possible

The video explores the concept of wrap around effects in 2D and 3D universes, using examples like the game of asteroids and a 3-torus. It discusses how light behaves in these universes, creating the illusion of infinite space. The video also delves into different geometries of the universe, including flat, spherical, and hyperbolic spaces, and introduces Euclidean three manifolds. It concludes by considering the possibility of non-flat universes and their implications on light and perception.

What happens to light in a wrap-around universe?

• It reflects back to the source.

• It gets absorbed by the boundaries.

• It continues infinitely without boundaries.

• It changes color as it travels.

In a 3D wrap-around universe, what happens when you pass through one face of the cube?

• You reappear on the opposite face.

• You see a reflection of yourself.

• You exit the universe.

• You get stuck in a loop.

Which of the following is believed to describe the geometry of our universe?

• Spherical

• Flat

• Hyperbolic

• Torus

What is unique about the 16-turn space?

• It has no boundaries.

• It is a cube with a half twist.

• It is non-orientable.

• It involves a 60-degree rotation.

How does the Klein bottle differ from other Euclidean manifolds?

• It is orientable.

• It has a side-to-side flip.

• It is infinite in all directions.

• It has uniform curvature.

What is a characteristic of a non-orientable universe?

• It is a perfect sphere.

• It is infinite.

• It has a side-to-side flip.

• It has uniform curvature.

Why is it challenging to observe copies of our solar system in a flat universe?

• The universe is not flat.

• The universe is too small.

• Light travels too slowly.

• Copies are too far apart.

What effect does a hyperbolic universe have on light beams?

• They stop moving.

• They remain parallel.

• They converge.

• They diverge.

In a spherical universe, what happens to parallel beams of light?

• They intersect.

• They diverge.

• They disappear.

• They remain parallel.

What is the main focus of the video?

• The history of the universe.

• The shapes and geometries of the universe.

• The speed of light.

• The size of the universe.