On March 21, 2026, a space telescope named the Einstein Probe witnessed what astronomers have long sought — the precise opening moment of a star's death, 515 million light-years from Earth. The signal was unexpectedly quiet: a faint X-ray whisper where science had taught us to expect a roar, followed by a supernova bearing all the chemical hallmarks of the universe's most violent explosions yet producing none of their signature fury. In the gap between what this dying star should have been and what it was, researchers have found not an anomaly but a new category — a reminder that the cosmos re