Here's a breakdown:

* Absolute Magnitude: Rigel has an absolute magnitude of -7.8, while the Sun has an absolute magnitude of +4.83. The lower the absolute magnitude, the brighter the star.

* Luminosity: The difference in absolute magnitude translates to a luminosity difference of about 40,000 times. This means Rigel emits 40,000 times more energy than the Sun.

It's important to note that these figures are approximate. The exact brightness and luminosity of stars can vary slightly depending on the specific wavelength of light being measured.