A star is twenty light years away from the earth. Suppose it brightens up
suddenly today. After how much time shall we see this change?
20 years
Answers
Answered by
0
Answer:
I can't understand ur question
Answered by
11
Answer:
yes 20 years
Explanation:
- light year is the distance travelled by light in a year
- if something is 20 light years away it will takes 20 year to the light to reach us
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