How do Black Holes Make a Shadow? - by PaulMattSutter
of two supermassive black holes, one in the Virgo galaxy and one in our own. The images show a ghostly glow surrounding a void of complete nothingness.
One, there must be an event horizon to create a shadow. The event horizon absorbs any light emitted by objects behind the black hole, preventing that light from reaching us. But the black hole itself has such an extreme amount of gravity that it can bend and magnify background images. This causes the shadow to appear much larger than the event horizon itself due to this magnification effect.
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