Message #242836

[Comet]

An example of a very small universe containing only 48 stars. A spaceship flying among these stars cannot find the edge of this universe. If the ship exits on one side of the universe it reemerges on the other side. The people in the spaceship see an infinite number of stars all around them. This universe has no boundary and no centre.
(2) Where did the Big Bang occur in the Universe?

There is a common assumption that the Big Bang was an explosion that occured in empty space and that the explosion expanded into the empty space. This is wrong.
Space and time were created in the Big Bang. At the beginning of the universe, the space was completely filled with matter. The matter was originally very hot and very dense and then expanded and cooled to eventually produce the stars and galaxies we see in the universe today.