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Big Black Holes Lurk Inside Most Galaxies

Most galaxies (if not all) have unbelievably immense black holes at their centers. We can't see them, but instruments like the spectrograph on Hubble can measure how the black holes affect the matter surrounding them, which is how we determine their presence.


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  Black Hole M87
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Signature of M84The colorful "zigzag" at left is the signature of a supermassive black hole in the center of galaxy M84. The black hole was discovered using Hubble's imaging spectrograph.


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