Supernovae can expel several solar masses of material at speeds up to several percent of the speed of light. This drives an expanding shock wave into the surrounding interstellar medium, …

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

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 …

Dec 24, 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 …

4 days ago · In a new video, astronomers have compiled 25 years' worth of observations of the remnant of Kepler's Supernova, or SN 1604, revealing the astonishing changes visible even …

5 days ago · Watch a real supernova blast evolve over 25 years in new telescope video The shockwave has traveled half a light-year.

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 …

What is a supernova? Learn how massive stars explode, the types of supernovae, and the famous cosmic events captured by astronomers.

Supernovae are thus essential to life. After a core collapse supernova, all that remains is a dense core and hot gas called a nebula. When stars are especially large, the core collapses into a …

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.