Tuesday, June 11, 2019
"The Big Bang Wasn't an Explosion" (Thaller); the Universe is super round
“The Big Bang Wasn’t an Explosion”. Michelle Thaller says “Visualize It Like This”.
A good way to visualize this is to imagine you are living on the surface of a Baby Trump baby balloon, and it is constantly expanding. There is no edge to the surface you are living on. You are living on the surface of a sphere and there is no edge. Sorry, flat earth people.
Likewise, the Universe has no boundary in 3-dimensional space. That is because it is part of a 4-dimensional (or more) manifold. The way this gets experienced as time dilation as your velocity approaches that of light. Think of time dilation as taking a short cut through the interior of the Trump balloon, without making it pop.
It’s theoretically possible for a teenage Clark Kent to travel through the universe at relativistic speeds and visit many places, and he might return to where he started from in a normal lifetime. In a sense, the universe is round.