6. 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.
Click on the right option
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. ✅