the crab nebula is the remnant of an exploded star. the explosion was witnessed by Chinese astronomers in the year 1054 ce. the crab nebula is 6500 ly away. this means the explosion occurred in what year? A.6500 BCE B. 5446 BCE C. 1054 BCE D. 1054 CE (Please explain reasoning)
A light-year is used for distance that the light has traveled for 1 year, so they saw the explosion in 1054 which means that it exploded back in the 5446, since it's 6500 light years away.
