Hypernovae May Be All Hype, No Nova
Astrophysicists think that hypernovae are the most powerful stellar explosions in the Universe. They're the most explosive type of core-collapse supernova. But the evidence for them is not voluminous, and new research pokes holes in it, pointing out that hypernovae may not actually exist.
We haven't written up this one. Universe Today has the full story — the link below goes straight to it.