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Supernova - Wikipedia
Supernova SN 1994D (bright spot on the lower left), a Type Ia supernova within its host galaxy, NGC 4526 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 nuclear fusion.
What Is a Supernova? | NASA Space Place – NASA Science for Kids
A supernova is the biggest explosion that humans have ever seen. Each blast is the extremely bright, super-powerful explosion of a star. An illustration of one of the brightest and most energetic supernova explosions ever recorded. Image credit: NASA/CXC/M.Weiss What causes a supernova? One type of supernova is caused by the “last hurrah” of a dying massive star. This happens when a star ...
Supernova | Definition, Types, & Facts | Britannica
Supernova, any of a class of violently exploding stars whose luminosity after eruption suddenly increases many millions of times its normal level. When a star ‘goes supernova,’ considerable amounts of matter may be blasted into space with such a burst of energy as to enable the star to outshine its entire home galaxy.
Supernovae - NASA
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What Is a Supernova? - Space
A supernova is what happens when a star has reached the end of its life and explodes in a brilliant burst of light.
Near-Earth supernova - Wikipedia
A near-Earth supernova is an explosion resulting from the death of a star that occurs close enough to the Earth, less than roughly 10 to 300 parsecs [33 to 978 light-years] away, [2] to have noticeable effects on its biosphere. An estimated 20 supernova explosions have happened within 300 pc of the Earth over the last 300 thousand years. Type II supernova explosions are expected to occur in ...
What Is a Supernova? Definition, Types, and Famous Examples
What is a supernova? Learn how massive stars explode, the types of supernovae, and the famous cosmic events captured by astronomers.
Supernova - ESA/Hubble
Supernova explosions are spectacular exceptions to that rule. Several different pathways can lead to a supernova explosion, one of which is the death of a supermassive star. After a supermassive star has begun to die, it goes through various stages of fusing different elements, forming a red supergiant.
What is a supernova? - EarthSky
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.
15 Facts About Supernovas: The Universe’s Biggest Explosions
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-process, builds atomic nuclei in fractions of a second. Without supernovas, the universe would contain mostly hydrogen and helium.
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