As a unit of measuring distances in outer space one lsquo Astronomical Unit rsquo stands for........

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As a unit of measuring distances in outer space, one ‘Astronomical Unit’ stands for

Distance between the sun and the nearest star Proxima Centauri.

Distance between the sun and the earth.

Distance between the sun and the last planet of the solar system i.e. Neptune.

None of the above.

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Explanation:

2nd option is correct.
As a unit of measuring distances in outer space, one ‘Astronomical Unit’ stands for distance between the sun and the earth.
An Astronomical Unit (AU) is the average distance between Earth and the Sun, which is about 93 million miles or 150 million kilometers. Astronomical units are usually used to measure distances within our Solar System.