Supernova candidate

A supernova candidate is a star that

is suspected to explode in a supernova:

Nearby star explosion may represent risk to Earth

atmosphere by destroying ozone layer,

which protects the surface from harsh

ultraviolet radiation of the Sun and cosmic

rays.

IK Pegasi B is the closest supernova

candidate.

Recently, Betelgeuse was suspected due

the star luminosity changing drastically:

this was interpreted by some as early warning

that Betelgeuse is going to become supernova.

https://en.wikipedia.org/wiki/Betelgeuse#2019%E2%80%9320_fading

More:

https://en.wikipedia.org/wiki/List_of_supernova_candidates