The radio source ________ is believed to lie in the center of our Galaxy.Group of answer choicesSgr A*47 Tucanae3C 273Cygnus X-1M-8, the Lagoon Nebula

The radio source Sgr A* is believed to lie in the center of our Galaxy.

Explanation:

Sgr A* (Sagittarius A-star) is a supermassive black hole located at the center of the Milky Way Galaxy, specifically in the constellation Sagittarius. It has a mass equivalent to approximately four million solar masses. Sgr A* was identified as a significant radio emission source and has been extensively studied using various wavelengths, including radio, infrared, and X-ray. Observations of stars orbiting around this area provide compelling evidence of its black hole nature. In contrast, other options such as 47 Tucanae, 3C 273, and Cygnus X-1 are notable astronomical objects but are not located at the center of our Galaxy. Thus, the correct answer is Sgr A*.