Star Types

Paraphrased from Wikipedia, the free online encyclopedia.
==Stellar types==
===Introduction===
In astronomy, stars are grouped based on how they look. We use a special tool to spread out the light from a star into its colors, like a rainbow with lines in it. These lines tell us about what the star is made of and how hot it is. We give each star a short code, like a secret symbol, that tells us its temperature. The hottest stars are called O types, and the coolest are called M types. We also use numbers to show more details. For example, A8 is hotter than A9, and F0 is hotter than F1. There are special codes for other kinds of stars too, like white dwarfs and carbon stars. We also use Roman numerals to talk about the star's size. This helps us tell if a star is big or small. Some stars are giants, some are regular, and some are dwarfs. The Sun, for example, is a G2V star, which means it's a medium-sized star with an average temperature.
===Color explanation===
The regular way we talk about star colors only looks at the brightest part of their light. But in reality, stars give off light in all colors. When we mix all these colors, they look white. So, the colors we see with our eyes are much lighter than what we usually say they are. This lightness means that simplifying star colors might trick us. Except when it's dark, stars don't really appear green, blue-green, dark blue, or violet. Stars that we call "yellow," like the Sun, actually seem white. "Red" stars are more like a deep yellow or orange, and stars we call "brown" wouldn't really look brown. They might seem like faint red or grayish-black to someone nearby.
===Contemporary stellar classification===
The way we group stars nowadays is called the Morgan–Keenan classification. Each star gets a letter grade (from an older system) and a number grade to show how bright it is. These grades together make the star's type. There are other ways to group stars too, like the UBV system. It looks at the colors of stars using special filters. These colors are given names like "U−V" or "B−V". They tell us about the star's colors in different light.
====Harvard classification====
An astronomer named Annie Jump Cannon made a way to organize stars called the Harvard system. She made it simpler than the previous method by Draper. Stars are put into groups based on their colors and features. They are given a single letter from the alphabet, and sometimes a number too. Stars on the main sequence have temperatures that range from about 2,000 to 50,000 degrees Kelvin. But stars that are more advanced can be even hotter, going above 100,000 degrees Kelvin. The letters show how hot the star's outer part is, and they're usually listed from the hottest to the coldest.
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=== In SE ===
In the game of Space Engine, these star types mainly contribute to the types of planets that form around them. Star types M - F are the ones that take up the vast majority of life bearing planets. Brown dwarfs are too cold for surface life and anything from A - O and WR is too hot and too short lived to have complex life in the planets around them. 
==== Representations ====
File:Star Tpes-001.png|O Star
File:Star Tpes-002.png|B Star
File:Star Tpes-003.png|A Star
File:Star Tpes-004.png|F Star
File:Star Tpes-005.png|G Star
File:Star Tpes-006.png|K Star
File:Star Tpes-007.png|M Star
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