Stars are grouped according to their spectral characteristics by single letters of the alphabet, optionally with numeric subdivisions.

The seven main types of stars. How they’re classified and their roles in stellar evolution, lifecycle stages, and how they appear in the night sky.

Star classification chart & guide. Learn about all the main star types and their characteristics, including life cycle, mass, size, luminosity, temperature.

This diagram shows typical average properties for the different types of stars. There is also a negative version of this diagram which might be easier to print.

Oct 22, 2024 · Scientists call a star that is fusing hydrogen to helium in its core a main sequence star. Main sequence stars make up around 90% of the universe’s stellar population. They range in …

In astronomy, stars are classified based on their spectra. Different types of stars (listed below) have different spectral characteristics and, even though they only differ in brightness to the unaided eye, …

Dec 4, 2025 · The generally accepted system of stellar classification is a combination of two classification schemes: the Harvard system, which is based on the star’s surface temperature, and …

There are seven main types of stars. In order of decreasing temperature, O, B, A, F, G, K, and M. O and B stars are uncommon but very bright; M stars are common but dim.. An easy mnemonic for …

This chart displays the different classifications of stars, their average temperature, and their average size. After measuring the properties of individual stars, how do astronomers use this information to …

Stars, those luminous spheres of cosmic wonder, come in a variety of shapes, sizes, and colors, each with its own unique characteristics and properties. From blazing blue giants to dim red dwarfs, the …