In this movie-style poster, the viewer gets the feeling of being on a precipice, teetering just on the edge of a black hole’s event horizon. The event horizon isn’t a solid surface like Earth’s or even the Sun’s. It's the boundary where the black hole's escape velocity equals the speed of light, the speed limit of the universe. Once matter crosses the event horizon, it will never escape the black hole.
Credit: NASA's Goddard Space Flight Center Conceptual Image Lab
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