Astronomers May Have Spotted a Never-Before-Seen “Superkilonova” Hidden Inside a Supernova

A double explosion may have generated both gravitational waves and light. When the largest stars exhaust their fuel, they end their lives in powerful supernova explosions. These blasts scatter heavy elements such as carbon and iron into space, helping enrich the universe. A different and far rarer kind of cosmic explosion, known as a kilonova, [...]