File:Universe bounded unbounded finite infinite 1.jpg

Image is author/uploader's own work. As to the universe's size and shape, there are three possibilities. Figure A: It is infinite & unbounded; the space you can roam around on (in this example, a line) is unlimited; and as you move in one direction and you'll never reach a boundary. Figure B: It is finite & bounded; the space you can move on is limited; and if you move in one direction, eventually you will meet an edge (the boundary). Figure C: It is finite & unbounded; the space you can move on is limited (in the example, the rim); but you can keep on going forever and will not be stopped by a boundary; you will just end up where you started.

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