UNIVERSE
THE SUN
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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the speed that light travels in a year
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the speed that light travels from the sun to earth
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the distance light travels in a year
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None of the above
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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: -This duration is a bit of a problem, as it makes space exploration a painstakingly slow process. Even if we hopped aboard the space shuttle discovery, which can travel 5 miles a second, it would take us about 37, 200 years to go one light-year.
Detailed explanation-3: -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.