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UPSC Civil Service Prelims Paper I 2021 (General Studies)
MCQ (Single Correct Answer)
+2
-0.66
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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
UPSC Civil Service Subjects
Comprehension
Data Interpretation and Sufficiency
EXAM MAP