A supernova (pl.: supernovae) is a powerful and luminous explosion of a star. A supernova occurs during the last evolutionary stages of a massive star, or when a white dwarf is triggered into runaway …

Sep 25, 2025 · A supernova of a star more than about 10 times the size of our sun may leave behind the densest objects in the universe— black holes. The Crab Nebula is the leftover, or remnant, of a …

Dec 7, 2025 · supernova, any of a class of violently exploding stars whose luminosity after eruption suddenly increases many millions of times its normal level. The term supernova is derived from nova …

Dec 9, 2025 · The bright binary star system V Sagittae will flare up multiple times before finally going supernova within the next 100 years. When it explodes, it could be visible to the naked eye even in ...

1 day ago · Astronomers may have spotted the first known "superkilonova," a supernova that creates two mini-neutron stars that then smash together in the only event powerful enough to forge elements …

4 days ago · A massive star explodes in a supernova, collapsing into a stellar core that forms two neutron stars. The neutron stars spiral together and merge, sending gravitational waves rippling …

3 days ago · The combination of a supernova and a kilonova may have produced a rare space explosion that astronomers have never seen before

Oct 3, 2025 · What is a supernova explained simply? Learn how stars explode, the types of supernovae, what they leave behind, and the most famous supernovae in history.

A supernova can light the sky up for weeks, and the massive transfer of matter and energy leaves behind a very different star.

Supernovas are some of the brightest events in the universe, occasionally outshining entire galaxies at their peak. Many supernovas can be seen from billions of light-years away, and nearby supernovas …