Here's why:

* Stellar Mass and Lifetime: A star's lifetime is directly related to its mass. More massive stars burn through their fuel much faster than less massive stars.

* Blue Stars: Blue stars are extremely hot and massive. They fuse hydrogen into helium at an incredibly rapid rate, exhausting their fuel supply in a few million years.

* Yellow Stars: Yellow stars, like our Sun, are smaller and less massive. They burn their fuel at a slower rate, allowing them to live for billions of years.

In summary:

* Blue stars: Short lifespans (millions of years)

* Yellow stars: Long lifespans (billions of years)

The relationship between a star's color and its lifespan is due to the connection between color, temperature, and mass. Blue stars are hotter and more massive, leading to shorter lifespans. Yellow stars are cooler and less massive, resulting in longer lifespans.