The most massive stars in the Universe are also the shortest-lived. The more mass a star has, the more quickly it burns through its fuel reserves, resulting in lifespans that are less than around 10 million years.
This fascinating fact leads us to a puzzle. Most of these stars are found relatively close to the regions where they were born. But a number of them have been found lurking in strange pockets of the Milky Way, far from the galactic disk where star formation takes place; in other words, their birthplaces.
This absolute dilly of a cosmic pickle, having long perplexed astronomers, may now have an explanation thanks to new research. The team also calculated that the star is about 17 times the mass of the Sun, with an average temperature of roughly 30,000 Kelvin. At that mass and temperature, the star should be around 5 million years old, with a margin for error of about 2 million years. Its maximum lifespan is approximately 8.3 million years.
This is what the team thinks happened with HD 93521. It started its life as a binary consisting of two middling-mass stars, which merged together to form the star as we see it today in the relatively recent past.
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