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This illustration compares the environment around NGC 4151's supermassive black hole with the orbits of the planets in our solar system тАФ the planets themselves are not shown to scale. Echoes of X-ray flares detected in XMM-Newton data demonstrate that the X-ray source (blue sphere, center) is located above the black hole's accretion disk. The time lag between flares in the source and their reflection in the accretion disk places the X-ray source about four times Earth's distance from the Sun. Credit: NASA's Goddard Space Flight Center