a) Because Star A's temperature may be higher and the body my be larger than Star B.
b) I got no idea how to work it out. I wasn't if i have to find all the unknowns.
In a particular binary star system, star A has apparent brightness 8x10^(-13) and star B has apparent brightness 2x10^ (-14).
a) Explain how it is possible to deduce that star A has a higher luminosity than star B.
b) The surface area of star B is 10 000 times smaller than that of Star A...