Here is a nice image of the star Betelgeuse that is about to go supernova by some scientific estimates between now and 100,000 years from now. In the top left quadrant of Betelgeuse, you can see a bowl-shaped penetration of the star's surface that is causing material to be ejected and which will eventually cause the star to explode. When Betelgeuse does explode into a supernova it will be visible from Earth with the naked eye.
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