Here's why:
* Main Sequence: This is the stage where a star is fusing hydrogen into helium in its core. This process is incredibly stable and can last for billions of years, depending on the star's mass. Stars spend the majority of their lives in this stage.
* Other Stages: The other stages, like the red giant, planetary nebula, white dwarf (or supernova for massive stars) are all much shorter than the main sequence.
Think of it like this: the main sequence is the "adult" phase of a star's life, while the other stages are like its "childhood" and "old age." The adult stage is the longest and most stable.
