No light of any kind, including X-rays, can escape from inside the event horizon of a black hole, the region beyond which there is no return. How can we learn about black holes if they trap light, and can't actually be seen? Image Credit: NASA/JPL-Caltech/Roma Tre Univ.ฤก. This supermassive black hole has been extensively studied due to its relatively close proximity to our galaxy. The X-ray light is coming from an active supermassive black hole, also known as a quasar, in the center of the galaxy. High-energy X-rays (magenta) captured by NASA's Nuclear Spectroscopic Telescope Array, or NuSTAR, are overlaid on visible-light images from both NASA's Hubble Space Telescope and the Sloan Digital Sky Survey. Galaxy NGC 1068 is shown in visible light and X-rays in this composite image.
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