 A once in a lifetime event. So is this like a supernova? Is that what you're describing? Good question. It's a little different. So a nova is a rapid increase in the brightness of a star. So in this case, T. coronae borealis is a binary star system. And that's made up of a white dwarf. That's a dead star about the size of Earth and a red giant. So the white dwarf basically sucks material from the red giant, which causes a buildup of pressure and heat on the surface of the white dwarf. And eventually there's an explosion.