The black hole at the center of our Milky Way galaxy
It is known as Sagittarius A* (pronounced "Sagittarius A-star"). It is located in the constellation Sagittarius, and its discovery has provided strong evidence for the existence of supermassive black holes at the centers of most, if not all, galaxies.
Sagittarius A* is estimated to have a mass of about 4 million times that of our Sun. This determination is based on the orbital motions of stars near the galactic center.While black holes themselves are points in space with almost zero volume, the region around Sagittarius A* where gravitational forces are extremely strong is called the event horizon. The event horizon of Sagittarius A* is thought to have a diameter of around 24 million kilometers (15 million miles).Sagittarius A* is challenging to observe directly because it does not emit light. However, astronomers use various techniques, such as observing the orbits of nearby stars, to infer its presence and characteristics. It was first identified through the observation of stars orbiting an invisible, massive object.
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