“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.
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