Frequently Asked Questions
What is a light year?
The distance light travels in one Julian year: 9.461 trillion km, or 5.879 trillion miles. The nearest star, Proxima Centauri, is 4.24 light years away.
Nautical mile vs statute mile?
A nautical mile is 1.852 km, a statute mile is 1.609 km. The nautical mile equals one arcminute of latitude, which is why it is used in marine and air navigation.
How many km in a marathon?
Exactly 42.195 km, or 26.2188 miles. The odd distance was set at the 1908 London Olympics to start at Windsor Castle and finish in front of the royal box.
What is an astronomical unit (AU)?
The mean Earth-Sun distance: 149,597,870.7 km. AUs are used for distances within the solar system; light years for distances between stars.
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