closed universe

Orchy was at the center of its own little closed radiant universe.

Relativity predicts that a closed universe contains more matter and energy than a certain fixed amount.

Each system is now in effect a closed universe.

In a closed universe, he believed that Mach's principle would hold.

But let us begin with a question: Do you know the difference between an open universe and a closed universe?

"I thought the eschaton only existed in a closed universe."

A "closed" universe is curved so that the whole thing will eventually collapse.

Like Earth's surface, this model has no edges and would seem to require a closed universe.

Sliced horizontally, it would look like a circle, or a closed universe.

With a positive cosmological constant, it could also occur in a closed universe.