Across the universe, dark matter annihilation could be warming up dead stars 

 Neutron stars could act as gravitational traps for dark matter, forcing these mysterious particles to collide, annihilate and warm up otherwise cold dead stars. 

https://cdn.mos.cms.futurecdn.net/HK66gUtUcyc8vCYULvaqo.png

https://www.space.com/dark-matter-annihilation-neutron-stars