# 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 mm World record long jump (man 2010) 8.95 m Height of an adult 1.75 m Length of a marathon (approximately) 40 000 m = 40 km Distance of the Earth from the Sun 150x109 m Distance light travels in a year 1016 m = 1013 km Radius of the observable universe 1025 m Masses Mass of an electron 10-30 kg Mass of a person 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 2x1030 kg Mass of the Universe 1050 kg Times Time for light to cross a nucleus 10-23 s One 'beat' of the clock in a 'fast' PC 10-9 = 1 ns One heart beat 1 s World record for 100m (man 2010) 9.58 s Time to boil an egg 100 s Length of a football match 1025 m A school morning 10 000 s One day 8.64x104 s One year 3.2x107 s 'Average' human lifetime 2.5x109 years Time for our galaxy to rotate once 7x1015 s = 2x108 years Age of the Universe 1018 s

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

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