Morgan-Keenan classification

The Morgan-Keenan classification, often abbreviated as MK classification, is a system used to categorize stars based on their temperature and luminosity. It divides stars into different spectral classes, such as O, B, A, F, G, K, and M, with 'O' being the hottest and 'M' the coolest. Each class is further divided into numbered subclasses. This classification helps astronomers understand the properties of stars, their stages of development, and their potential for hosting planets. The system highlights the diverse characteristics of stars, including color, size, and brightness, which are essential for studying the universe.