Here are some important details:
* Luminosity is the total amount of energy a star emits per second.
* Regulus is the brightest star in the constellation Leo and is a blue-white main-sequence star.
* Its luminosity is measured relative to the Sun, which has a luminosity of 1.
* This high luminosity is due to Regulus being much hotter and more massive than our Sun.
Therefore, Regulus is a significantly brighter star than our Sun, radiating much more energy into space.
