Here's why:

* The Sun is an average star. It falls somewhere in the middle of the luminosity scale for stars.

* Most stars are smaller and cooler than the Sun. This means they produce less light and energy, making them less luminous.

* Red dwarfs are the most common type of star in the galaxy. They are significantly smaller and cooler than the Sun, making them far less luminous.

While there are certainly stars much more luminous than the Sun (like supergiants and blue giants), they are much rarer than the smaller, dimmer stars.