Why astronomers need astronomical units? there are 2.54, Ask an Expert

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Need help answering these 3 questions

1. Why astronomers need astronomical units?

2. There are 2.54 centimeter or 0.0254 meter in 1 inch. How many meters in 300 inches?
How many centimeters? (Label how some units cancel each other as we did in the example above.)

3. In August 2003, Mars made its closest approach to Earth for the next 50,000 years. At that time, it was only about .373 AU away from Earth. How many km is it?

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