Sagittarius A

Sagittarius A or Sgr A is a complex radio source at the center of the Milky Way. It is located in the constellation Sagittarius as seen from Terra, and is hidden from view at optical wavelengths by large clouds of cosmic dust in the spiral arms of the Milky Way.

It consists of three components, the supernova remnant Sagittarius A East, the spiral structure Sagittarius A West, and a very bright compact radio source at the center of the spiral, Sagittarius A*. These three overlap: Sagittarius A East is the largest, West appears off-center within East, and A* is at the center of West.

Sagitarius A*
See also: Sagittarius A*(wikipedia)

It's been known that there is a supermassive black hole at the center of the galaxy at the location termed Sagittarius A* (abbreviated Sgr A*) for some time.

Research
The Galactic Center is of great interest to Union Scientists, so the Science Corps established a Research Station only 200 light years from the actual Galactic Center. ( Gal Center Research Facility)