What are the Variations Among Main Sequence Stars?

Main sequence stars can vary widely in their properties. For example, O-type stars are very hot, bright, and massive, while M-type stars are cool, dim, and low-mass. These differences affect not only the star's lifespan but also the types of planetary systems they can host. Additionally, some main sequence stars exhibit magnetic activity, flares, or pulsations, which can impact their surrounding environments.