• The most common way of classifying main sequence stars is by color (Table below) Each class of star is given a letter, a color, and a range of temperatures.
  • The hotter a main sequence star is, the brighter it is.
  • A star remains on the main sequence as long as it is fusing hydrogen to form helium.
  • Bigger stars produce more energy, so their surfaces are hotter.
  • But some very small stars are very hot.
  • Some very big stars are cool.
  • Large stars burn through their supply of hydrogen very quickly.
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