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Which one of the following is a reason why astronomical distances are measured in light-years?
Distances among stellar bodies do not change.
Gravity of stellar bodies does not change
Light always travels in straight line.
Speed of light is always same
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). Hence option 4th is correct.
By: Parvesh Mehta ProfileResourcesReport error
Noorbir Singh
answer will not be 4th option?
Corrected
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