This image shows the first X-ray picture ever taken of a comet. In the image, the X-rays from the comet seem to come from a crescent-shaped region on the sunward side of Comet Hyakutake. Unlike the visible light from the comet, the nucleus or solid body is not only not the brightest point in the comet. In fact, the scientists say, the nucleus does not show up in the X-ray.

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