A View from the Back of the Envelope top

Length
m (meter)
Scale of some things
Landmarks
Scaling the universe to your desktop
Length Area Volume
[ Scale | Landmarks | Other ]

Rough Draft

Links

Orders of magnitude: Distance A long length scale diagram.
Baez's Length scales in physics

Conversions

unit
megaparsec Mpc 1022 × 3.086
parsec pc 1016 × 3.086
light-year ly 1016 × 0.9461
astro. unit AU 1011 × 1.496
light-second ls 108 × 2.998
mile mi 103 × 1.852 nautical
mile mi 103 × 1.609 land
kilometer km 103 × 1.000
yard yd 100 × 0.9144
foot ft 10-1 × 3.048
hand 10-1 × 1.016
inch in 10-2 × 2.540
mil 10-5 × 2.540
micron 10-6 × 1.000 um
angstrom A 10-10 × 1.000
10 ×
10 ×

Notes

Currently in pre-first-draft state...
wavelength of a 1 eV photon (hc/eV) 1.240 × 106
From [Cow, p235]:
 atmosphere: 1/2 pressure 5600 m, top of troposphere 12000 m
 mean oceanic depth 3730 m, of oceanic mixed surface layer 75 m
 mean elevation of continents 840 m
 average Earth-Sun 1.495 × 1011
 earth radius 6.4 × 106
 radius universe 10^26, sun 6.96e08, moon 1.74e06
 mean Earth-Moon 3.84e08
galactic disk is ~30 kpc, so 0.93 × 1021 m

Baez's Length scales in physics
(I don't really understand this yet, but its something like: