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UPSC Prelims GS - 2021
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Question 76
MEDIUM
Correct:
+2
Incorrect:
-2
Which one of the following is a reason why astronomical distances are measured in light-years?
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.
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Section-1
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