1	1 example  	my house
2	1 prefix   	deka-
3	2 example  	sports field, Great Pyramid
4	2 prefix   	hecto-
5	3 example  	neighborhood
6	3 prefix   	kilo-
7	4 example  	Mt. Everest
8	5 example  	Bay Area, large city
9	6 example  	California, large state
10	6 prefix   	mega-
11	6.5 example	Moon
12	7 example  	Earth, JupiterÕs Great Red Spot
13	8 example  	Jupiter
14	8.5 example	light second
15	9 example  	Moon orbit, Sun
16	9 prefix   	giga-
17	10 example 	4 days of Earth orbit
18	11 example 	Earth orbit (1 AU)
19	12 example 	Jupiter orbit (5 AU), Betelgeuse
20	12 prefix  	tera-
21	13 example 	Solar system
22	14 example 	heliopause (maximum likely)
23	15 prefix  	peta-
24	16 example 	Oort cloud
25	16 unit    	light year
26	16.5 example	distance to nearest stars
27	17 example  	Crab Nebula (M1)
28	18 example  	globular star cluster (M3)
29	18 prefix   	exa-
30	19 example  	distance to Orion Nebula (M42)
31	20 example  	Magellanic Cloud (either one)
32	21 example  	Milky Way Galaxy (diameter)
33	21 prefix   	zetta-
34	22 example  	distance to Andromeda Galaxy
35	23 example  	Local Group (galaxy cluster)
36	24 example  	Local Supercluster
37	24 prefix   	yotta-
38	25 example  	Great Wall
39	26 example  	the known universe
40	-1 example  	my hand
41	-1 prefix   	deci-
42	-2 example  	my finger tip, pebble
43	-2 prefix   	centi-
44	-3 example  	pencil tip, sand grain
45	-3 prefix   	milli-
46	-4 example  	thickness of human hair
47	-5 example  	cloud droplet, human cell
48	-6 example  	bacterium, red light wave
49	-6 prefix   	micro-
50	-6 unit     	micron
51	-7 example  	smoke particle
52	-8 example  	thickness of flagellum
53	-9 example  	thickness of DNA helix
54	-9 prefix   	nano-
55	-10 example 	atom
56	-10 unit    	angstrom
57	-11 example 	hard X-ray wave
58	-12 prefix  	pico-
59	-13.5 example	typical atom nucleus
60	-14 example  	nucleus of lead
61	-15 example  	proton, neutron
62	-15 prefix   	femto-
63	-18 example  	electron, quark
64	-18 prefix   	atto-
65	-21 prefix   	zepto-
66	-24 prefix   	yocto-