Recent content by Koos Roegholt

The center is not in the universe. It lies at the center of the 4-d sphere of which the 3-d universe is the (curved) surface.

A spherical piece of space can have a much larger volume than one would think based on its radius. The space within the sphere is funnel-shaped and ultimately tubular, stretched to an arbitrary length. The matter density has a maximum, but the total amount of matter does not. So a black hole is...