Here's why:

* Main Sequence Stars: These stars are in the longest and most stable phase of their lives. They fuse hydrogen into helium in their cores, generating the energy that makes them shine. This is the stage where stars spend the majority of their existence.

* Other Star Types: While other types of stars exist, they are much less common and often have shorter lifespans. These include red giants, white dwarfs, neutron stars, and black holes.

Key takeaway: Because main sequence stars are so common and long-lived, they make up the majority of the visible stars in the night sky.