What does it mean to dream about supernova?
A supernova usually points to a violent ending that is also a release, a thing destroying itself in a burst of light.
Four ways to read it
Each reading below comes from a named tradition and a cited source, so you can see where it came from and decide what fits your dream.
Freud
Freud would read the exploding star as a feeling that builds until it bursts, ruin and brilliance at once. Such a blast can stand for an emotion that could no longer be held. What it destroys and lights is the clue.
After Freud, The Interpretation of Dreams (Brill trans., 1913), public domain.Jung
Jung might see the supernova as a death that scatters new material into the world, an end that seeds beginnings. It can mark a transformation that costs the old self entirely. The light outlasts the star.
Jungian concept (our summary).Modern
Threat-simulation theory reads a supernova as the sleeping mind rehearsing a sudden, total upheaval. It often follows waking dread of something blowing up or coming apart. The blast mirrors that fear of collapse.
Threat-simulation theory (our summary).Mythological
A new star blazing in the sky was read across cultures as a great omen, the birth or death of something vast announced overhead. Such lights marked turning points in the affairs of the world. They stood for endings that are also signs.
Rosmerta Publishing editorial synthesis (after Bulfinch; Brewer).