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A 'Light-year' is scientifically defined as:

  1. A
    light emitted by sun in one year.
  2. B
    time taken by light to travel from Sun to Earth.
  3. C
    the distance travelled by light in free space in one year.
  4. D
    time taken by earth to go once around the Sun.

Solution & Step-by-step Explanation

A light-year is a unit of astronomical distance. It equals the total linear distance that a beam of light travels through empty space (vacuum) in one Julian year, which is roughly .

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A 'Light-year' is scientifically defined as:
A
light emitted by sun in one year.
B
time taken by light to travel from Sun to Earth.
C
the distance travelled by light in free space in one year.
D
time taken by earth to go once around the Sun.

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Units and MeasurementsAstrophysics

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