# Masses, lengths and times

The following list gives the orders of magnitude of a whole range of distances, masses and times throughout the Universe.

 Distances Diameter of a sub-nuclear particle 10-15 m Distance across an atom 10-10 m = 0.1 nm Distance a fingernail grows in 1s 10-9 m = 1 nm Wavelength of yellow light 6x10-7 m = 600 nm Diameter of a human hair 5x10-6 m = 50 μm Height of an adult human 1.75 m World record long jump (man) 8.95 m Length of a marathon run (approx.) 40 000 m Distance light travels in a year (in free space) 1016 m = 1013 km Radius of the observable universe 1025 m = 13 700 light years Masses Mass of an electron 10-30 kg Mass of an adult human 100 kg Mass of a small car 1000 kg Mass of a diesel locomotive (average) 50 000 kg Mass of the Earth 6x1024 kg Mass of the Sun 2x10-30 kg Mass of the Universe (approx.) 1050 kg Time intervals Time for light to cross a nucleus 10-23 s One 'beat' of the clock in fast PC 10-12 s = 1 ps One heart beat 1 s Mens' world 100 m record (2016) 9.58 s Time to boil an egg 100 s Length of a football match 5000 s A school morning 10 000 s One day 86 400 s One year 3.2x107 s 'Average western'human lifetime 2.5x109 s = 80 years Rotation period for our galaxy 7.7x1015 s = 2x108 years Age of the Universe 1018 s = 13 700x1012 years

You might like to look at some more interesting magnitudes of quantities by visiting
Physics facts

A VERSION IN WORD IS AVAILABLE ON THE SCHOOLPHYSICS USB