Sagittarius A is a complex radio source located in the center of our galaxy . It consists of the objects Sagittarius A * , Sagittarius A East and Sagittarius A West.
Sagittarius A East
Presumably, the remains of a supernova exploded in the period from 35,000 to 100,000 years ago, due to the approach to the object Sagittarius A * ; the width is about 25 light years .
Sagittarius A West
From the Earth, the object looks like a spiral with three arms, is a complex of three gas and dust clouds rotating around the object Sagittarius A * with a speed of 1000 km / s. The outer layer of clouds is ionized . The source of ionization are clusters of massive stars.
Sagittarius A *
The object is supposedly a supermassive black hole .