Harvard Classification Scheme

The Harvard Classification Scheme is a method used by astronomers to categorize stars based on their characteristics, mainly their surface temperature and brightness. It assigns stars a letter code ranging from 'O' to 'M,' with 'O' being the hottest and brightest, and 'M' being cooler and dimmer. This system helps scientists understand and compare stars quickly by noting their spectral features and luminosity. For example, an 'A' star is hot and bright, while an 'K' star is cooler and less luminous. It's a vital tool for studying star types and their life cycles.