L☉, or "solar luminosity," is a unit of measurement used in astronomy to describe the brightness of stars compared to our Sun. One L☉ is equivalent to the total amount of energy emitted by the Sun each second, which is approximately 3.828 x 10²⁶ watts. This standard helps astronomers compare the brightness of different stars and understand their energy output. When a star is said to have a luminosity of 10 L☉, it means it is ten times brighter than the Sun. This measurement is crucial for studying stellar evolution and the life cycles of stars, including their formation and eventual demise, such as in supernovae or black holes.