Supernova refers to an event in space, not something on Earth, relating to the end of a star's life cycle. The Hubble telescope captured an image of a supernova occurrence.
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Cataclysmic Brightness
A supernova is noted for its intense brightness, outshining entire galaxies for a short time. The supernova was so bright that it could be seen from Earth with the naked eye.
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Explosive End
Supernova implies a violent, destructive ending of a star, but it's a natural part of the universe. Astronomers believe our sun will not end as a supernova.