Question 1

How far does light travel in an hour?

Accepted Answer

Light travels about 1.079 billion km in one hour. 1 light-hour = 7.21 AU. Jupiter is about 35-52 light-minutes from Earth.

Question 2

How many AU in a light-hour?

Accepted Answer

1 light-hour ≈ 7.21 AU. Pluto is 4-7 light-hours from Earth depending on orbital positions.

Question 3

Is this conversion factor exact?

Accepted Answer

Metric-to-metric conversions are exact (1 km = 1000 m). Imperial-to-metric factors like 1 inch = 2.54 cm are exact by international agreement.

Question 4

Why do some countries use different units?

Accepted Answer

Historical reasons - the metric system spread from France after 1795. The US, UK, and a few others retained older systems. Science uses metric worldwide.

light-hours to AU Converter

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