From the infinitesimally small to the incomprehensibly large, this table lists some of the numbers which are relevant to the universe.
9.11 x 10-31 1.48 331 464 1,000 5,780 29,800 200,000 552,000 1.56 × 107 2.998 × 108 1010 8 × 1010 1.5 × 1011 2 × 1013 9.46 × 1015 1.41 × 1017 1021 7 × 1022 6 × 1024 3.86 × 1026 8.8 × 1026 1027 2 × 1030 1.2 × 1044 3 × 1052 4 × 1069 1080 320 Approximate density (in kg/m3 Density (in kg/m3 ) of the universe as a whole ) of Earth’s atmosphere at sea level Speed (in m/s) of sound in air at sea level and 0°C Speed (in m/s) of the Earth’s rotation at the equator Density (in kg/m3 ) of liquid water at 4°C Temperature (in ° Kelvin) of the surface of the sun Speed (in m/s) of the Earth in orbit around the sun Speed (in m/s) of the solar system in orbit around the Milky Way galaxy Speed of the Milky Way galaxy, relative to the cosmic microwave background (CMB) radiation Temperature (in ° Kelvin) at the core of the sun Speed (in m/s) of light (or any electromagnetic radiation) in a vacuum Temperature (in ° Kelvin) in a supernova explosion Rough estimate of the number of stars in the Milky Way galaxy (estimates vary up to 4 × 1011 Mean distance (in metres) between the Earth and the sun (1 Astronomical Unit, AU) Approximate density (in kg/m3 ) of the universe at the electroweak epoch, about 10–12 Distance (in metres) travelled by light in one year (1 light-year or 9.46 trillion km) Half-life (in seconds) of uranium (4.468 billion years) Approximate diameter (in metres) of galactic disc of Milky Way galaxy (100,000 light-years) Rough estimate of the number of stars in the observable universe (estimates vary from 1022 Mass (in kg) of the Earth Total energy output (in Joules) of the sun each second Approximate diameter (in m) of the visible universe (93 billion light-years) Temperature (in ° Kelvin) of the universe 10–35 Mass (in kg) of the sun (1 solar mass) Estimated energy (in Joules) released in a supernova explosion Estimated mass (in kilograms) of the observable universe Estimated total mass-energy (in Joules) of the observable universe Estimated total number of fundamental particles in the observable universe (other estimates go up to 1085 ) seconds after the Big Bang, at the start of the inflationary epoch to 1024 ) seconds after the Big Bang )
