Posts Tagged ‘distances’

Astronomical Unit

The mean (average) distance of the Earth to the Sun is termed 1 Astronomical Unit (1 AU). It is a convenient way of describing distances within our Solar System.

Nominally, 93 million miles or 150 million km. It is therefore a lot more convenient to use but even this mind-bogglingly enormous distance is inadequate to express the distance to galaxies so that is when parsecs are used.

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