In a study published in Monthly Notices of the Royal Astronomical Society, astronomers said the graveyard consists of once massive suns that are now black holes and neutron stars.
According to the study, the massive"galactic underworld" stretches three times the height of the Milky Way.
According to scientists, when a massive star more than eight times larger than the sun collapses, the core compresses onto itself until it becomes either a neutron star or a black hole. “The oldest neutron stars and black holes were created when the galaxy was younger and shaped differently, and then subjected to complex changes spanning billions of years. It has been a major task to model all of this to find them," Tuthill said according to the news release.
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