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Key Facts In This Video
Physicists say it should be possible to create a black hole out of nothing but light, which is called a kugelblitz. 00:03
Usually, a black hole is formed when a lot of matter is packed into very little space, which increases its density. 00:22
To create a kugelblitz, you would need all of the light put out over 10 years by all the stars within 350 light-years of Earth. 02:06