GK
THE UNIVERSE
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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parsec
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Astronomical Units
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Light year
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Kilometers
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Detailed explanation-1: -Parsecs : Many astronomers prefer to use parsecs (abbreviated pc) to measure distance to stars. This is becau se its definition is closely related to a method of measuring the distances between stars. A parsec is the distance at which 1 AU subtends an angle of 1 arcsec.
Detailed explanation-2: -The light travels at a speed of 3×108 meters per second and one light year = 9.46×1012 km. The appropriate unit for measuring the distance of stars from the earth is lightyears.
Detailed explanation-3: -Stars are away from the earth millions of kilometres away. It is not convenient to express such a large distance in the units of km. So, the distance of stars from the earth is expressed in light years. One light year is the distance that light travels in one year in a vacuum.