Where are all the galaxy's dead stars hiding? New research draws the map.
During the Milky Way's roughly 13.6-billion-year history, billions of stars have formed, grown and ultimately died in spectacular supernova explosions. So, where are all of their corpses hiding?
The resulting map revealed a"galactic underworld" of black holes and neutron stars , which lurks in every corner of the Milky Way — and far beyond it as well. According to the researchers, the galactic underworld stretches more than three times the height of the Milky Way itself, while as many as one third of the galaxy's dead stars have been jettisoned deep into space by the force of their own end-of-life explosions, never to return.
The quick and the deadIn their research, the team focused on two types of stellar remains: neutron stars — ultra dense stellar cores that pack a sun's worth of mass into a ball no wider than a city — and black holes, which are enormous objects so dense that not even light can escape their gravitational pull.
Astronomers have detected both classes of stellar remains in our galaxy, though not nearly enough to account for the billions of dead stars in the Milky Way's past.
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