[Answer] In space what does AU mean?

Step 1 : Introduction to the question " In space what does AU mean? "

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Astronomical units, abbreviated AU, are a useful unit of measure within our solar system. One AU is the distance from the Sun to Earth's orbit, which is about 93 million miles (150 million kilometers) or about 8 light-minutes. Thinking in terms of astronomical units makes it easier to think of relative distances in space. The solar system is extremely large and the mile is just too small of a unit to use for measuring interplanetary distances.

They make it easy to see that Jupiter orbits five times farther from the Sun than Earth, and that Saturn is twice as far from the Sun as Jupiter. Calculate the scale value for each Solar System object using a scale factor of 10 centimeters per astronomical unit (AU).

The Light Year is about 64,500 times larger than the Astronomical Unit, too large to be appropriate for an object the size of our solar system. The Light Year is fine for measuring distances to stars or other galaxies but not for measuring distances within our own solar system.

More Info: earthsky.org

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