# If everything in existence were increasing in size at some rate, would we be able to detect it?

Would our eyes observe any changes?

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This may be helpful: lightandmatter.com/html_books/genrel/ch08/ch08.html#Section8.2 (subsection 8.2.6) –  Ben Crowell May 7 '13 at 4:32
This should have some different tag, not soft-question, but I'm not sure at the moment which tag fits it –  David Z May 7 '13 at 6:13
You need to be more specific. By "everything" what do you mean? Macroscopic objects like people and buildings and such? If so, volume scales cubicly and area quadratically. Our bodies would overheat or our bones would break. If you mean at the subatomic level, making an electron "bigger" doesn't have a lot of physical meaning given our current understanding of things. –  Brandon Enright May 7 '13 at 6:52
This question appears to be off-topic because there are two quite different questions which potentially belong not even on the same site. The first one seems to be rather a biological question and the second could be seen as an experimental question. –  Dilaton Jul 23 '13 at 23:33

Depends.

If you simple assume matter growing we would see the distance between the surfaces of celestial bodies diminishing. Given that we regularly monitor the distance between the surfaces of the Earth and Moon by laser ranging to accuracies of less than one cm (which means less than one part in $10^8$ over the time the project has been running). This is not observed.

If you assume that space is expanding then you have the Hubble expansion and the dark energy, both of which have strong observational support,

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mabe an addendum is needed on the bound states . If space were expanding within an atom ..... –  anna v May 7 '13 at 3:55