When a dying star runs out of fuel and sheds its outer layers, its remaining core can become an approximately Earth-sized, extremely dense stellar remnant called a white dwarf. For a white dwarf that is not strongly rotating or magnetized, there is a well-known upper mass limit of about 1. 4 tim...
Source: [Phys.org](https://phys.org/news/2026-10-strong-magnetic-fields-white-dwarfs.html)