Astronomers have found evidence that one of the most massive white dwarfs known has an oxygen-neon core instead of the more common carbon-oxygen core. The finding is important because the composition of a white dwarf's core determines how it will evolve. A paper outlining this discovery was pub...
Source: [Phys.org](https://phys.org/news/2026-08-ultramassive-white-dwarf-earth-size.html)