Light year is a measurement of

Correct option is B

A light-year is a measurement of stellar distances. It is the distance that light travels in one year, approximately 9.46 trillion kilometers (5.88 trillion miles).
Important Key Points:
1. Light-year: Distance light travels in one year.
2. Stellar distances: Used to measure vast distances between celestial objects.
3. Speed of light: Approximately 299,792 kilometers per second.
4. Astronomical measurement: Essential for understanding the scale of the universe.
5. Practical use: Helps in expressing distances in astronomy more conveniently.
6. Cosmology: Critical for studying the structure and expansion of the universe.
Knowledge Booster:
 Speed of aero planes (c): Measured in terms of velocity, not light-years.
 Speed of light (d): The basis for calculating a light-year, not a distance measurement.
 None of these (a): Incorrect, as a light-year measures stellar distances.