GK
THE UNIVERSE
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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distances between the Sun and objects in our solar system
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distances between planets in our solar system
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distances between stars and galaxies
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the distance between Earth and the Moon
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Detailed explanation-1: -Parsecs : Many astronomers prefer to use parsecs (abbreviated pc) to measure distance to stars.
Detailed explanation-2: -Many astronomical objects like stars or galaxies are very far away from the earth & giving their distances in the kilometres unit becomes very inconvenient. Light-year is a large unit and equals the distance travelled by light in one year. Hence, the large distances are expressed in light-years.
Detailed explanation-3: -The average distance between galaxies is about one million light years. There are roughly 100 billion galaxies in the observable universe. Another, often-used unit of distance is the parsec. One parsec is approximately 3.26 light-years.
Detailed explanation-4: -Exp) Option d is correct. The astronomical distances are measured in light-years because, the speed of light is constant throughout the universe and is known to high precision. In a vacuum, light travels at 670, 616, 629 mph (1, 079, 252, 849 km/h).