Instead of an explosion, imagine the expanding Universe is like a loaf of raisin bread rising in the oven. From the perspective of any raisin, all the other raisins are moving away in all directions. But unlike a loaf of raisin bread, you could travel in any one direction within the bread and eventually return to your starting raisin. Remember that our entire comprehension is based on 3-dimensions. If we were 4-dimensional creatures, this would make much more sense. For a much deeper explanation, I highly recommend you watch my good friend, Zogg the Alien explain how the Universe has no edge.
After watching his videos, you should totally understand the possible topologies of our Universe. You can also listen to our podcast episode explaining this here — What is the Universe Expanding Into — Show notes and transcript.
Or subscribe to: astronomycast. Podcast audio : Download Duration: — 4. Synthesizing nanomaterials from nature's blueprints 7 hours ago.
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Your friend's email. Your email. The universe does not expand into anything because, as far as any evidence we have goes, it is everything that exists. In other words, there is nothing outside of the universe. We often think of the big bang as happening in space in the centre of the universe, but this is only partly true.
What really happened is that the big bang is the universe. It was not an explosion in space; space is the explosion. The space between objects has been expanding ever since. The fact that this is unfathomable should make it all the more amazing. Andrew Busch. Instead of thinking of the universe as inflating like a balloon, I think of it as a giant ball of dough being stretched in all directions by several chefs. All we know, and this is what we mean by the expansion of the universe, is that, on average, every galaxy is getting increasingly far away from every other galaxy, at an increasing rate, with no central point.
So, as far as you know, nothing exists outside the flat. It just is everything. Is it infinite or finite? There are many unanswered or even unanswerable questions at the moment. Competing models for strings have now been consolidated into a unified description, and suggest these structures may interact with massive, higher dimensional surfaces called branes.
Other branes—containing other types of universes—may co-exist in hyperspace, and neighboring branes may even share certain fundamental forces like gravity.
Both eternal inflation and branes describe a multiverse, but while universes in eternal inflation are isolated, brane universes could bump into each other. Some suspect these differing multiverse hypotheses may eventually coalesce into a common description, or be replaced by something else. While these models are inspired and guided by many scientific experiments, there are very few objective experiments to directly test them, yet. Until the next Edwin Hubble comes along, scientists will likely be left to argue about the elegance of their competing models… and continue to dream about what, if anything, lies beyond our universe.
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