Length
Smallest sensible length: The Planck Length --> How big the Universe is when gravity was no longer
a quantum thing: 10 to the -35 meters
17 orders of magnitude higher: Classical radius of the proton: 10 to the -18 meters
3 orders of magnitude higher: Classical Radius of Electron "orbit" about an atomic nucleus
10 to the -15 meters
3 orders of magnitude higher: Wavelength of 1 MEV gamma-ray
solid: 10 to the -12 meters
2 orders of magnitude higher: Spacing of atoms in solid copper
on time: 10 to the -10 meters
1 order of magnitude higher: Molecular mean free path in the atmosphere 10 to the -9 meters
3 orders of magnitude higher: Typical size of a cell 10 to the -6 meters (1 micron)
2 orders of magnitude higher: Typical size of dust 10 to the -4 meters
1 order of magnitude higher: Unraveled human DNA strand 10 to the -3 meters (1 mm)
3 orders of magnitude higher: A small cow 10 to the 0 meters
1 orders of magnitude higher: A small water cow 10 to the 1 meters
3 orders of magnitude higher: Radius of Eugene Oregon 10 to the 4 meters
2 orders of magnitude higher: Radius of Earth 10 to the 6 meters
2 orders of magnitude higher: Radius of Sun 10 to the 8 meters
3 orders of magnitude higher: Distance of Earth to Sun 10 to the 11 meters
6 orders of magnitude higher: Distance to the Nearest Star 10 to the 17 meters
3 orders of magnitude higher: Distance to the center of the galaxy 10 to the 20 meters
2 orders of magnitude higher: Distance to M31 10 to the 22 meters
2 orders of magnitude higher: Distance to Coma Cluster of Galaxies 10 to the 24 meters
2 orders of magnitude higher: Distance to the Horizon 10 to the 26 meters
Mass Scales
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The Electronic Universe Project
e-mail: nuts@moo.uoregon.edu
