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Asked by culshawwesttaylor to Sam, Ben, Clare, Ezzy, Mario on 16 Mar 2012. This question was also asked by rowellhayes, sophia2012.
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Sam Vinko answered on 13 Mar 2012:
Probably not in the sense that come first to mind – that is, that at some place you could ‘step off it’. But this doesn’t mean the universe has to be infinite – it could still be finite in size! The Earth is far from infinite but walking in any direction will not bring you to an edge because its a ‘closed system’, being a sphere. Now you could thin of the edge of the Earth as the surface, an the ‘beyond’ the sky, but thats only because the surface is in two dimensions while space has three.
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Clare Burrage answered on 15 Mar 2012:
There’s an edge to what we can see if the universe, because the universe is only 13 billion years old and light can only travel at a fixed speed. This means that there’s only so far light can have traveled since the beginning of the universe and we can’t see any further than this.
We can’t know what the universe looks like further away than this, but it probably looks quite a lot like the bits of the universe that we can see. -
Elizabeth Pearson answered on 15 Mar 2012:
It depends what you mean by edge. After the Big Bang all the matter in the universe shot out in every direction and will have only gone so far, so there will be a point where there aren’t any more galaxies or anything.
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Mario Campanelli answered on 16 Mar 2012:
no, by definition if you look from inside it. General relativity says that the universe is the space, and you can’t escape from it. It is like a 2-dimensional being asking if there is an edge to the earth, and there is not if looking in 2-d: you can travel forever on the earth without finding its edge
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