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The colour.

  • O stars ≥ 33,000 K blue
  • B stars 10,000--33,000 K blue to blue white
  • A stars 7,500--10,000 K white to blue white
  • F stars 6,000--7,500 K yellowish white
  • G stars 5,200--6,000 K yellow
  • K stars 3,700--5,200 K orange
  • M stars ≤ 3,700 K red
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In main-sequence stars how does brightness relate to temperature?

The brightness is very similar to the temperature, the brightness relies on the temperature


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