Main Sequence

Real World Example

Imagine trying to organize a diverse group of people by age and height, noticing that most fit into a predictable pattern where older people are generally taller. This is similar to how stars in the universe are organized by their brightness and temperature, forming a predictable pattern known as the main sequence on the H-R diagram. Just as most people fall along a diagonal trend from younger and shorter to older and taller, about 90% of stars fall along a diagonal band on the H-R diagram, from hot and bright to cool and dim, illustrating a natural order in both scenarios.