NGC4151 at hundreds of thousands of miles per hour. The horizontal line is light from the intensely bright region near the galaxy nucleus. Emission at two wavelengths characteristic of Oxygen atoms in the gas clouds is visible along this line. As evidence mounts, the widely accepted explanation for energetic nuclear activity in galaxies is based on material spiraling into a central black hole with over a million times the mass of our sun . The rotating disk of interstellar debris which develops is thought to blast out high velocity jets along the axis of the disk.
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