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Re^5: [OT] A prediction.by Athanasius (Archbishop) |
on Apr 28, 2016 at 15:47 UTC ( [id://1161784]=note: print w/replies, xml ) | Need Help?? |
Hello BrowserUk, As jdporter says, the expanding balloon analogy is not the best. The two I’ve seen are:
— the point in each case being that while the “space” (bread dough, rubber sheet) expands, the entities in it (raisins, thumbtacks) do not: In fact, not everything grows as the universe expands. In the example of the rubber sheet, the distance between thumbtacks keeps increasing but the thumbtacks themselves remain the same size. Similarly, while distant galaxies are pulled away from each other by the expansion, smaller objects like meter sticks, people, and the galaxies themselves are held together by forces that prevent them from expanding. So we expect that billions of years from now galaxies will still be roughly the same size they are today, but the distances between them will on average be much larger. A minor point: And if you accept the indivisibility of space & time; that they are aspects of the same thing as General Relativity suggests, ... I believe that the concept of spacetime is actually a corollary of Special Relativity. If anyone is interested, I can recommend the book Simply Einstein: Relativity Demystified (2003) by Richard Wolfson as an excellent introduction for the layman (like me). It has a section which explains in detail the rationale for viewing space and time as aspects of a unified spacetime in the light of Special Relativity. BTW, the “taster” paper you cite up-thread seems to say only that the speed of light may not be constant over time. Why do you assume that this implies it is increasing?
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