Is a blue star a dying star?

Answer 1

A blue star is a star on the main sequence and thus not dying.

Actually, blue stars are fairly new, while red ones are generally older (not necessarily/ entirely true). This is the result of a process called the main sequence. As the stars use up their supply of hydrogen they lose mass. The original mass of star affects the future size are rate of mass loss. As stars lose mass they cool and change color. Supergiants may start out blue and evolve into red supergiants (sun type stars can as well).

Blue stars are generally, as of now, the largest (by brightness), and by far the hottest. But to have such hot surface temperatures the stars would have to burn off a massive amount of fuel. In doing so the star basically dies faster. Making their life spans from hundreds of millions of years to a limit of a billion, more or less so. Compared to our sun that is a considerable short lifespan, since the sun, by humanity's calculations, will have used most of its primary and greatly needed fuel in 5 billion years.