Here's why:
* Main Sequence Stage: Stars like our Sun spend the vast majority of their lives in the main sequence stage. During this phase, they fuse hydrogen into helium in their core, generating the energy that makes them shine.
* Fuel Consumption: The rate at which a star burns its fuel is directly related to its mass. Larger stars burn through their fuel much faster than smaller stars.
* Sun's Lifespan: Our Sun is a medium-sized star, and its expected lifespan is approximately 10 billion years. It's already about halfway through its life.
Important Note: The lifespan of a star can vary slightly depending on its precise mass and composition.
