The astronomical object known as Crab Nebula is thhe remnant of an exploded star. The explosion was seen by the Chinese in 1054 C.E. However, the Crab Nebula is about 3500 LY distance from the Earth In what year did the star actually explode.
Stacey Warren - Expert brainly.com
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if the crab nebula is 3500 [lyr] away, then light traveling from the crab nebula will take 3500 [yr] to reach earth
so to find the year that the light left the crab nebula just take away the travel time from the year it arrived at earth 1054 CE
btw, im not sure where you got the distance to the crab nebula from because i thought it was 6500 lyr (not 3500 lyr)
my textbook says its about 3500 LY away
dont for get that the year will be before 0 CE so it will be ... BCE
(well i guess you can use that value if its in your book)
so what was the first answer you gave because that seemed to make a lot of sense if the speed of light is pretty fast