Range and Order of Lengths

The sizes of the objects in the universe varies in a wide range.

Size of a proton	10-15
Size of atomic nucleus	10-14
Size of hydrogen atom	10-10
Length of typical virus	10-8
Wavelength of light	10-7
Size of RBC	10-5
Thickness of a paper	10-4
Height of the Mt. Everest above sea level	104
Radius of the Earth	107
Distance of moon from the earth	108
Distance of the Sun from the earth	1011
Distance of Pluto from the Sun	1013
Size of our galaxy	1021
Distance to Andromeda galaxy	1022
Distance to the boundary of observable universe	1026

There are also some special units for large and small lengths

1 fermi = 1 f = 10^-15 m

1 angstrom = 1 Å = 10^-10 m

1 astronomical unit = 1 AU (average distance of the Sun from the Earth) = 1.496 × 10¹¹ m

1 light year = 1 ly = 9.46 × 10¹⁵ m (distance that light travels at 3 × 10⁸ m/s in a year)

1 parsec = 3.08 × 10¹⁶ m (distance at which average radius of earth's orbit subtends an angle of 1 arc second)

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