Stellar classification - Wikipedia
Stars are grouped according to their spectral characteristics by single letters of the alphabet, optionally with numeric subdivisions.
Types of Stars | Stellar Classification, Lifecycle, and Charts
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.
Stellar classification | Types, Spectral Classes & Luminosity ...
Dec 4, 2025 · From hot stars to cool, the order of stellar types is: O, B, A, F, G, K, M. (A traditional mnemonic for this sequence is “Oh Be A Fine Girl [or Guy], Kiss Me.”) Additional letters have been …
Types - NASA Science
Dec 18, 2025 · 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 …
The Classification of Stars: Understanding Stellar Types and ...
Feb 17, 2025 · From massive blue giants to faint red dwarfs, these celestial bodies are classified based on their physical properties. This classification system helps astronomers understand a star’s life …
What is a Star? Types, Life Cycle, and Fascinating Facts
May 3, 2025 · Along the way, we’ll explore the types of stars that fill our galaxy, their brilliant life cycles, and some astonishing facts that make stars among the most fascinating objects in all of nature.
List of Different Star Types - Star Classification & Guide
Using the letters O, B, A, F, G, K, and M, the 7 main types of stars are easily classified from hottest (O) to coolest (M). The temperature of each spectral class is then further subdivided from hot to cool by …