Light year is

Asked in WBPSC CS Prelims 2019 · Topic: Measurement/Unit (Non-SI Units (e.g., Astronomical Unit, Light-Year, Electron-Volt))

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

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