Which one of the following is a reason why astronomical distances are measured in light-years?

Which one of the following is a reason why astronomical distances are measured in light-years?

[UPSC Civil Services Exam – 2021 Prelims]

(a) Distances among stellar bodies do not change.

(b) Gravity of stellar bodies does not change.

(c) Light always travels in straight line.

(d) Speed of light is always same.

Answer: (d)

Explanation:

A light-year is a measurement of distance in space.
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).
To find the distance of a light-year, you multiply this speed by the number of hours in a year (8,766). The result: One light-year equals 5,878,625,370,000 miles (9.5 trillion km).

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Consider the following statements:

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Consider the following statements:

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Which one of the following Schedules of the Constitution of India contains provisions regarding anti-defection?

The provisions in Fifth Schedule and Sixth Schedule in the Constitution of India are made in order to

Under which Schedule of the Constitution of India can the transfer of tribal land to private parties for mining be declared null and void?

The Ninth Schedule was introduced in the Constitution of India during the prime ministership of

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Categories

Which one of the following Schedules of the Constitution of India contains provisions regarding anti-defection?

The provisions in Fifth Schedule and Sixth Schedule in the Constitution of India are made in order to

Under which Schedule of the Constitution of India can the transfer of tribal land to private parties for mining be declared null and void?

The Ninth Schedule was introduced in the Constitution of India during the prime ministership of

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