Speed of aeroplanes
Speed of light
Stellar distances
Speed of rockets
Answer is Right!
Answer is Wrong!
The correct answer is: C. Stellar distances.
A light year is a unit of astronomical distance equivalent to the distance that light travels in one year, which is 9.4607 Ã 1012 km (nearly 6 trillion miles). It is used to measure distances to stars and other celestial objects outside the Solar System.
The speed of aeroplanes is measured in kilometers per hour (km/h) or miles per hour (mph). The speed of light is a fundamental constant of nature that is the same for all observers, regardless of their motion. It is denoted by the letter c and has a value of 299,792,458 meters per second. The speed of rockets is measured in kilometers per second (km/s) or miles per second (mph).
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