Some Numbers...

Speed of light: C = 2.998 X 108 m/s
Light year: LY = 9.46 X 1015 m
Absolute Zero temperature: To = -273°C
Mass of Earth: Me = 6.0 X 1024 kg
Diameter of Earth: De = 1.3 X 107 m
Mass of Sun: Ms = 2.0 X 1030 kg
Diameter of Sun: Ds = 1.4 X 109 m
Age of Universe: Tu = 13 X 109 years
Number of cells in adult human: = 60 X 1012 cells
Number of atoms in one cell: = 120 X 1012 atoms
Number of atoms in one cm3 of air we breathe: = 1019 atoms
Number of atoms in one cm3 of interstellar gas of the Galaxy: = 1 atom
Number of atoms in one m3 of intergalactic space: = 1 atom
Number of electrons (or protons) in the universe = 1080 electrons
Number of photons in the universe: = 1089 photons