The nuclear bulge of the Milky Way cannot be seen clearly from Earth.
Using the Andromeda Galaxy as a visual guide to our own, we believe that the nuclear bulge is a collection of star clusters and clouds of dust and gas.
The detection of gamma ray, X ray, infrared, and radio waves gives us more information.
Something in the nuclear bulge emits powerful radio waves; huge streams of very hot gas shoot out from the center.
Some astronomers believe that a supermassive black hole exists at the Milky Way’s center, even though we don’t have the instruments or knowledge yet to be 100% certain of what is in the middle of this swirling galaxy.
Astronomers are confident that the Milky Way galaxy has a supermassive black hole at its center, in a region called Sagittarius A, because the only known object which can pack 4.1 million solar masses into a volume that small is a black hole.
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