$($a$)$

Determine the amount by which the mass of Star A decreases each second, if its power output is $5\mathrm{.}181026$ W$.($Give your answer in kg$/$s$.)$

kg$/$s

$($b$)$

What If$?$ Rigel, a supergiant star, is much more massive than Star A and has a power output of approximately $1\mathrm{.}081032$ W$.$ How much time is required for Star A to lose the same amount of mass as Rigel does in $1\mathrm{.}00$ s$?$ Express your answer in units of days.