Two astronomers are agreed on Supernova Charlie happened before Supernova Alpha, while other options are incorrect on the basis of light-years that measures the distances between two supernovae.
What do you mean by Supernova?
Supernova may be defined as a large explosion that takes place at the end of a star's life cycle.
Supernova Alpha is 8 thousand light-years away, while Supernova Charlie is 142 million light-years away. So, the Supernova Charlie takes time to fall its light into the earth's surface as compared to Supernova Alpha.
Therefore, Two astronomers agreed on Supernova Charlie which happened before Supernova Alpha.
To learn more about Supernovae, refer to the link:
https://brainly.com/question/1276261
