GK
GENERAL SCIENCE
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Speed of aeroplanes
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Speed of light
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Stellar distances
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Speed of rockets
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Detailed explanation-1: -Light-year is the distance light travels in one year. Light zips through interstellar space at 186, 000 miles (300, 000 kilometers) per second and 5.88 trillion miles (9.46 trillion kilometers) per year.
Detailed explanation-2: -The distance between stars is termed as stellar distance and is measured in light years, i.e, the distance travelled by light in a single year.
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.
Detailed explanation-4: -The correct answer is Distance. A light-year is a unit of distance. It is the distance that light can travel in one year. Light moves at a velocity of about 300, 000 kilometers (km) per second.