# The Astronomical Unit

About how many miles is our sun away from planet Earth?

You may use the fact that

• The speed of light is approximately $$3\times 10^8 \text{ metres/second}$$, and

• $$1\text{ mile}$$ is equivalent to $$1.609 \text{ km}$$.

• It takes about 8 minutes for light from the sun to reach us.

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