Distance and Intrinsic Brightness
Betelgeuse
Rigel
Rigel appears 1.28
times brighter than Betelgeuse,
Thus, Rigel is actually
(intrinsically)
1.28*(1.6)2 = 3.3 times brighter than
Betelgeuse.
But Rigel is 1.6 times
further away than Betelgeuse
