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Stars are divided by type.

Main Sequence Stars

  • Class M - A small red star that is generally a red dwarf but also sometimes a brown dwarf, these stars are extremely common and can last trillions of years.
  • Class K - Orange stars smaller than the sun, which are very common.
  • Class G - Yellow stars much like Sol.
  • Class F - A yellow-white star which is the brightest capable of supporting habitable planets naturally.
  • Class A - The smallest blue star, it isn't able to form habitable worlds.
  • Class B - A blue star between classes O and A in size. They cannot support habitable worlds.
  • Class O - A very rare giant blue star which is incapable of supporting habitable worlds.

Non-Main Sequence Stars

  • Class D - A degenerate white dwarf star no longer producing energy at it's core. White dwarves are as dense as G-class stars but as small in volume as some terrestrial planets. It is theorized that 97% of stars in the universe will eventually become white dwarves.
  • Class T - Class T Brown Dwarves are rare and cool dwarves which can reach temperatures as low as 250 K.
  • Class Y - Class Y Brown Dwarves are similar to Class T, but are hotter. T-Class Dwarves would persist several times the lifespan of the Universe.
  • Class L - The L-class Red Dwarves are unable to support Hydrogen fusion due to their limited masses.
  • Class S - Class S stars have a roughly equal amount of Oxygen and Hydrogen in their atmospheres (Main-Sequence Stars have mostly Oxygen), it is similar in heat to the K class of stars
  • Class C - The Carbon Stars, class C, have a higher amount of Carbon within their atmospheres than Oxygen, giving them a ruby red appearance and a variable temperature range.
  • Class W - Class W or WR, the Wolf-Rayet Star, is immensely hot and outclasses even the O-type star by several magnitudes in heat, reaching as much as 200,000 K.

Abnormal Stars

  • Neutron Stars - Neutron Stars have densities similar to those of G-class stars but extremely small volumes only a few kilometers across. The Neutron Star possesses an elephantine amount of heat that can be in excess of 600,000 K.
  • Exotic Stars - Stars not made of electrons, protons, neutrons, or muons, such as
    • Quark Stars - Stars made up only of quarks.
    • Strange Stars - made up only of strange quark matter, which is composed of Up Quarks, Down Quarks, and Strange Quarks.
    • Preon Stars - made up of sub-quark particles called Preons, which have not yet been proven to exist.
    • Boson Stars - A star made of Boson particles, rather than the Fermion particles that make up all other stars.
  • Dark Star - A star with an escape velocity greater to the speed of light, causing it to appear black to outside observers. Not to be confused with a black hole.
  • Darkmatter Star - A primitive, early star which predated the formation of the conventional stars, it was not composed of dark matter despite it's name (a star primarily composed of non-baryonic matter is called a Q-star) but instead simply had large densities of neutralino dark matter which produced heat through annihilation reactors within the star. The Darkmatter Star would be a 2-4000 AU black cloud with surface temperatures so cold that radiation on it could be observed by the naked eye.