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 …

5 days ago · 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 …

May 3, 2026 · 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 …

Mar 5, 2026 · During a supernova, temperatures and pressures become so extreme that nuclear reactions produce elements heavier than iron. This process, known as rapid neutron capture or the r …

Jun 19, 2023 · A supernova is what happens when a star has reached the end of its life and explodes in a brilliant burst of light.

Jun 2, 2025 · In a astronomical breakthrough, NASA's James Webb Space Telescope (JWST) has just released its first actual picture of a supernova—a milestone in our astronomical journey to the …

Nov 12, 2020 · A supernova is a star's colossal explosion at the end of its life, which can outshine its entire galaxy. Read about causes and types of supernovae here.

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James Webb Space Telescope captures GRB 250314A – the earliest supernova ever detected, exploding when the Universe was only 730 million years old. The faint red dot (zoomed inset) is the …

Oct 21, 2025 · A supernova is a giant stellar explosion that occurs when a star reaches the end of its life. During a supernova, the star suddenly increases in brightness by millions or even billions of times.