Binary star system T Coronae Borealis (T CrB) is about to go nova any day now. The recurrent nova explodes approximately every 79 or 80 years.

Once-in-a-lifetime star explosion, visible from Earth, could happen any day now

Source: space
Source Link: https://www.space.com/the-universe/stars/once-in-a-lifetime-star-explosion-visible-from-earth-could-happen-any-day-now