Quote:
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Originally Posted by phonicboom
I will now accept that I dont need to know and cant get a real answer for it. Yes using a photon as a point to measure from was a little daft. I was trying to get the to the two extremes of size that I can barly imaginge, then see how I fitted in.  thanks for the replies. |
Let's take the case of a hydrogen nucleus instead.
r
nucleus = 1.2 * 10^-15 m
r
universe = 1.5 * 10^10 ly = 1.4 * 10^26 m
(used alainprice's figure here)
V
nucleus = 3.14 * (1.2 * 10^-15 m)
3 * 4 / 3 = 1.4 * 10^-44 m
3
V
you = 7.5 * 10^-2 m
3 (sorry if it's a bit off 
)
V
universe = 3.14 * (1.4 * 10^26 m)
3 * 4 / 3 = 1.1 * 10^79 m
3
I think it is clear from above that you are closer in size to a hydrogen nuclues than the Universe (roughly 40 vs. 80 orders of magnitude).
EDIT: The number for the nucleus' radius is off by a bit.
This page has it (proton radius) to be 0.805 ± 0.011 and 0.862 ± 0.012 fm (10^-15 m). Doesn't change the conclusion though.