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&Quantity&Symbol & Value &
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&Speed of light (in vacuum)&

&

(exact)&
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&Newton's constant & G &

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&Planck's constant &

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&Electron charge (magnitude)&

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&Electric permittivity (vacuum)&

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&Magnetic permeability (vacuum)&

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&Fine structure constant &

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&Thompson cross-section&

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&Electron mass&

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&Proton mass&

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&Atomic mass unit (mass of

atom)

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&Boltzmann's constant &

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&Stefan-Boltzmann constant &

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&Avagardo's number &

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&Earth mass &

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&Earth radius (equatorial)&

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&Lunar mass &

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&Lunar radius &

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&Earth-Moon distance (mean) &

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&Earth-Sun distance (mean)&

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&Solar mass &

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&Solar radius (equatorial)&

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&Solar luminosity&

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&Temperature of microwave background &

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&Hubble constant&

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&Critical density &

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&Baryon density &

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&Cold dark matter density &

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&Total density &

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&Age of the Universe&

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&Electron Volt &

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&parsec &

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&year &

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