One astronomical unit is a distance equal to
1. 9.46*1015
2. 1.496*1011
3. 3*108
4. 3.08*1016
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AU : One Astronomical Unit (AU) is the average distance between the Sun and the Earth.
From that, your answer is option 2.
That is, 1 AU = 1.496 × 10^11 m
Just for info:
Option 1 is the distance of light year (ly) . One light year is the distance light travels in one year in vacuum.
Option 4 is the distance of 1 parsec (pc).
One Parsec is the distance at which 1 AU subtends an angle of exactly 1 second of an arc.
From that, your answer is option 2.
That is, 1 AU = 1.496 × 10^11 m
Just for info:
Option 1 is the distance of light year (ly) . One light year is the distance light travels in one year in vacuum.
Option 4 is the distance of 1 parsec (pc).
One Parsec is the distance at which 1 AU subtends an angle of exactly 1 second of an arc.
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