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A star was an enormous sphere that was primarily composed of super-heated hydrogen and helium that underwent nuclear fusion and produced heat and light. Essentially, stars were composed of plasma. Planetary systems would often form around stars when the gas and dust achieved stability. Stars were often classified by their size, color, and temperature. Most planets orbited yellow-orange stars of medium mass, which were termed as suns.

Types of stars[]

Stars were classified by sequence, which would include main sequence, pre-main sequence, post-main sequence, and compact stars. The main sequence stars were further classified into seven types:

  • "PRO"—Were protostars.
  • "LBV"—Were Luminous Blue Variables. These were incredibly hot, bright stars. They were unstable, and their luminosity often changed very quickly due to changes in their interior.
  • "WR"—Stars in this category were very bright and unstable, and they exhibited very powerful stellar winds, often loosing huge amounts of mass through these winds. They represented evolved Of-type stars.
  • "Of"—Stars in this category were incredibly large, blue and hot. Their surface temperatures were incredibly high. They were characterized as having a mass in excess of 100 ssm.
  • "O"—Stars in this category were blue and hot, and had a lifespan of a few million years.
  • "B"—Stars in this category were white-blue and hot, and had a lifespan of ten million years.
  • "A"—Stars in this category were white and hot, and had a lifespan of four hundred million to two billion years.
  • "F"—Stars in this category were yellow-white and of medium-temperature, and had a lifespan of four billion years.
  • "G"—Stars in this category were yellow and of medium-temperature, and had a lifespan of ten billion years.
  • "K"—Stars in this category were orange and cool, and had a lifespan of sixty billion years.
  • "M"—Stars in this category were red and cool, and had a lifespan of approximately ten trillion years.
  • "L"—Were a class of hot brown dwarfs, most similar in appearance to M-type stars, but unable to sustain fusion.
  • "T"—Were a class of brown dwarfs smaller and dimmer than L-type but larger and brighter than Y-type. They were cool enough to allow chemical compounds to exist.
  • "Y"—Were the smallest brown dwarfs. They were cool and often non luminous, and similar in appearance to planets. They were defined by having a history of nuclear fusion. Those that had never experienced any fusion were deemed gas planets rather than brown dwarfs.
  • "GG"—Were yellow giants/supergiants/hypergiants. These were a very rare type of evolved star, much hotter than red and orange giants/supergiants/hypergiants. They often formed from the most massive stars.
  • "KK"—Were orange giants/supergiants/hyperciants. These were a relatively rare type of evolved star, hotter than red giants/supergiants/hypergiants. These often formed from A-type stars.
  • "MM"—Were red giants/supergiants/hypergiants. These often formed from G-type main sequence stars or from larger O and B type stars that evolved into supergiants. They were cooler than KK and GG type evolved stars.
  • "DW"—Were white dwarfs.
  • "NE"—Were neutron stars.
  • "BH"—Were black holes.

"O" class main sequence stars were the largest of the stars, and the size would gradually decrease to the smallest "M" class stars.

Pre-main sequence stars were smaller than "M" class stars and included brown dwarfs and protostars. Post-main sequence stars were larger than "O" class stars and included red giants, blue giants, and red supergiants. Compact stars included white dwarfs, black dwarfs, neutron stars, and black holes.

External links[]

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