The distance of the red supergiant betelgeuse is approximately 643 light-years. if it were to explode as a supernova, it would be one of the brightest stars in the sky. right now, the brightest star other than the sun is sirius, with a luminosity of 26lsun and a distance of 8.6 light-years. how much brighter in our sky than sirius would the betelgeuse supernova be if it reached a maximum luminosity of 8.0×109lsun?

Explanation:

Basically, what the question wants to know is the ratio of  Betelgeuse's apparent brightness to that of Sirius.

Apparent brightness (AB) is defined as a function of luminosity (L) and distance (d) as follows:

Thefore, the ratio between both apparent brightnesses is:

Betelgeuse supernova would be 5.5* 10^4 brighter in our sky than Sirius if it were to explode

i think the answer is tomato juice? not entirely sure though