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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. 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.
Understanding the Context
The Crab Nebula is the leftover, or remnant, of a massive star in our Milky Way that died 6,500 light-years away. What Is a Supernova? | NASA Space Place – NASA Science for Kids 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 (Latin: “new”), the name for another type of exploding star.
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A supernova is what happens when a star has reached the end of its life and explodes in a brilliant burst of light. 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. A supernova creates a huge amount of light for a short amount of time. Astronomers hoping to study such fleeting events look for points of light that suddenly appear in the night sky.
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When certain stars die, they do not simply fade away. They explode. This tremendous stellar explosion is known as a supernova. It is one of the most powerful phenomena in the universe, capable of releasing more energy in a single moment than an entire galaxy emits over long periods of time.