Quote:
Quote by: Jinei  What are you talking about? A Universe is not a world and what does that last (bold) sentence mean??? |
Science fiction often gets it wrong. World, dimension, universe, they all get shuffled together.
For reference:
World. A big ball of rock or some other substance. Often found inside universes in large numbers, usually circling stars and sometimes with this weird blue-green crud called a biosphere growing on their surfaces. Danger: some elements of certain biospheres are known to be highly talkative and annoying.
Universe. A big bubble of space time full of all sorts of stuff like planets and stars. Our part of it has four dimensions. You can fly around in one with relative ease (if you happen to have a rocket ship) but getting to another one would require complicated hijinks like a wormhole.
Dimension. An axis of motion such as vertical, horizontal and side to side. Time is a dimension although we only travel in one direction along that axis. Read a book called
Flatland. There may be additional dimensions. You can travel along another hypothetical dimension but you can't be inside a dimension any more than you can be inside left.
For reference I think there are almost definitely other worlds, probably other dimensions and maybe other universes.