Particles of invisible dark matter can accumulate in a neutron star, the ultra-dense remnant of an exploded star. According to calculations by Einstein, neutron stars can exist, and they are actively studied. Just as in a thick batter, light berries are evenly distributed while heavy nuts sink to the center, so it is with dark matter: its light particles form a cloud around the star, making it fluffy and pliable, while heavier particles gather in the core, squeezing the star into a tight ball.
Data from X-ray measurements and recordings of ripples in space from star mergers show that the fraction of dark matter inside a typical neutron star does not exceed 11%. The most unexpected thing: if we ever find two stars of equal mass, but one deforms significantly more under tidal forces, that would be direct proof that dark filling is hidden inside it.
There is five times more dark matter in the Universe than ordinary matter, but no detector has yet caught its particles, and the Standard Model of physics cannot explain them.
If in the TV series 'Dark Matter' it opens doors to other worlds, then in reality, it may be hiding inside dead stars, changing their shape.