1 meter is the median size in the Universe

Human scale is about the middle of the range of logarithmic sizes.

Rank	Object Size or Diameter	Log Size, $m$
1	Neutrino cross-section diameter	$-24$
2	Electron, quark	$-18$
3	Proton	$-15$
4	Atom (H, C, Au), water molecule	$-10$
5	DNA molecule	$-9$
6	Amino acid	$-9$
8	Insulin (small protein)	$-8$
7	Virus	$-8$
9	Tintin (large human protein)	$-7$
10	Bacteria cell	$-6$
11	Average human cell	$-5$
12	Rydberg atom (Ce)	$-4$
13	Ant	$-3$
14	Mouse	$-2$
15	Human	$0$
	middle!
16	Blue whale	$1$
17	Large tree	$2$
18	Container ship	$3$
19	Moon	$6$
20	Earth	$7$
21	Earth-Moon distance	$8$
22	Jupiter	$8$
23	Sun	$9$
24	Earth-Sun distance (1 AU)	$11$
25	Solar system	$13$
26	Oort Cloud	$15$
27	Nearest star (Proxima Centauri)	$16$
28	Milky Way diameter	$21$
29	Local Group (galaxy cluster)	$23$
30	Observable universe	$26$

Comparisons

Entities	Sizes (m)	Ratio
Atom : Nucleus : Electron (solar sys model)	${10}^{-10}$ : ${10}^{-15}$ : ${10}^{-18}$	10,000x : 1,000x
Protein : Atom : Nucleus	${10}^{-8}$ : ${10}^{-10}$ : ${10}^{-15}$	100x : 10,000x
Cell : Protein : Atom	${10}^{-5}$ : ${10}^{-8}$ : ${10}^{-10}$	1,000x : 100x
Person : Cell : Protein	${10}^0$ : ${10}^{-5}$ : ${10}^{-8}$	10,000x: 1,000x
Football stadium : Football : Grain of sand	${10}^2$ : ${10}^{-1}$ : ${10}^{-3}$	1,000x : 100x
City : Street : Person	${10}^4$ : ${10}^1$ : ${10}^0$	1,000x : 10x
Earth to Moon : Earth : Moon	${10}^8$ : ${10}^7$ : ${10}^6$	10x : 10x
Earth : Moon : City	${10}^7$ : ${10}^6$ : ${10}^4$	10x : 100x
Earth-Sun distance : Sun : Earth	${10}^{11}$ : ${10}^9$ : ${10}^7$	100x : 100x
Solar System : Earth-Sun : Sun	${10}^{15}$ : ${10}^{11}$ : ${10}^9$	10,000x : 100x
Galaxy : Solar System : Earth-Sun	${10}^{21}$ : ${10}^{15}$ : ${10}^{11}$	1Mx : 10,000x

NEEDS CHECKING!