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Question

How many astronomical units are in a light year?
Asked by: Justin Dopiriak

Answer

A good approximation would be:

1 light-year = 63240 AU (astronomical units)

Just for information, 1 light-year is equivalent to the distance travelled by light in 1 year moving in a vacuum. 1 light-year is about 9.4607 * 1015 metres.

1 astronomical unit (AU) is equivalent to the average radius of the Earth's orbit. 1 AU is about 1.4960 * 1011 metres.

Simple arithmetic calculation yields the answer that 1 light-year = 63240 AU to a good approximation.
Answered by: Ryan Leong, Undergraduate, NUS, Singapore






Science Quote

'The true spirit of delight, the exaltation, the sense of being more than Man, which is the touchstone of the highest excellence, is to be found in mathematics as surely as in poetry.'

Bertrand Russell
(1872-1970)





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