Which one of the following is a reason why astronomical distances are measured in light-years?(2021)
a) Distance 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
Cosmologists use the light year as a measuring tool because speed of light in empty space /vacuum never changes. It remains constant
| M | T | W | T | F | S | S |
|---|---|---|---|---|---|---|
| 1 | 2 | 3 | 4 | 5 | 6 | |
| 7 | 8 | 9 | 10 | 11 | 12 | 13 |
| 14 | 15 | 16 | 17 | 18 | 19 | 20 |
| 21 | 22 | 23 | 24 | 25 | 26 | 27 |
| 28 | 29 | 30 | ||||
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