White dwarfs are burnt out stars that can explode into supernovae, and this process might be kicked off by a black hole made of dark matter in the heart of the star
Source:
https://www.newscientist.com/article/2226326-black-holes-formed-from-dark-matter-could-be-making-dead-stars-explode/?utm_campaign=RSS%7CNSNS&utm_source=NSNS&utm_medium=RSS&utm_content=home