The “Blaze Star” is what’s known as a recurrent nova. When a white dwarf in a binary system sucks enough hydrogen from its red giant companion, it triggers a thermonuclear explosion. That process works almost like clockwork and results in a bright flash that has been seen every 80 years or so by previous generations of astronomers in 1786, 1866 and 1946‚ and now, almost certainly in 2025-2026. There are records going back to 1217.
https://www.forbes.com/sites/jamiecartereurope/2025/03/27/blaze-star-how-to-prepare-for-the-biggest-sky-event-for-79-years/