The hottest and most massive class of main sequence stars, with surface temperatures exceeding 30,000 Kelvin and appearing blue or blue-white. These stellar giants are extremely luminous but have very short lifespans of only a few million years.
The 'O' designation comes from the Harvard spectral classification system developed in the early 1900s. Originally part of an alphabetical sequence, the O-type classification was retained when the system was reorganized by temperature, representing the hottest stellar category.
O-type stars are the cosmic equivalent of living fast and dying young! These blue giants can be 100,000 times brighter than our Sun but burn through their nuclear fuel so quickly that they barely have time to clear the stellar nurseries where they're born. When they die in spectacular supernovae, they seed the galaxy with heavy elements essential for planets and life.
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