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 …

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 …

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 …

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.

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

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 …

Mar 30, 2025 · A supernova is not just a star’s death—it is a dramatic event that reshapes the cosmos. These cosmic explosions are responsible for creating the elements that make up the …

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

Dec 23, 2024 · If a very nearby star goes supernova, it can genetically alter or possibly even destroy life on Earth. Even a fairly distant one often leaves visible wreckage that makes us …

Apr 25, 2025 · Before the invention of the telescope, Western astronomers used stella nova to refer to the appearance of such a temporary new star. Today, we know them to be not stars …