What stellar type produces the energetic blue light that signifies active star birth in galaxies?
Answer
Hot, massive main-sequence stars (O or B type)
The brilliant blue color observed in active star-forming regions, such as the arms of spiral galaxies, originates from very hot, massive stars classified typically as O or B type main-sequence stars. These stars possess tremendous luminosity and radiate intensely at blue wavelengths. However, due to their immense mass, their lifespan is extraordinarily short in cosmic terms, burning through their hydrogen fuel in only a few million years before dying, making them transient beacons of current stellar production.
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