What is the typical main-sequence lifespan cited for stars significantly larger and hotter than the Sun, like F-type stars?
Answer
Hundreds of millions or 3 to 4 billion years
Stars significantly larger and hotter than the Sun, such as F-types, burn fuel rapidly and often have lifespans of only hundreds of millions of years or around 3 to 4 billion years, which is insufficient time for complex life evolution.
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