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

Search

Loading






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 athematics as surely as in poetry.'

Bertrand Russell
(1872-1970)

Top Selling

Here are our physics & astronomy bestsellers:
Magnetic Levitator - Classic
KonusScience 5 Way Microscope Kit
CHEM C2000 Chemistry SuperKit v2.0
Snap Circuits Jr.
Periscope
Space Wonder Gyroscope
Solar Radiometer
Mini Plasma Ball
Smart Robot 4M Kit
130 Electronics Projects Kit

Sponsors

USC University of Southern California Dornsife College Physics and Astronomy Department McMaster University Physics and Astronomy Department