There are two galaxies that dominate the local group: our host galaxy, the Milky Way, and the Andromeda galaxy. Our home galaxy is called the Milky Way galaxy or Akashganga. It is spiral in shape and rotates slowly about its axis. It takes about 250 million years to complete one revolution.. At the center of our galaxy is a supermassive black hole in the region known as Sagittarius A. It has a mass of about 4 million times that of our Sun.

The Andromeda Galaxy is the closest major galaxy to the Milky Way, located about 2.5 million light-years away. It is the largest galaxy in the Local Group, which also includes the Milky Way, the Triangulum Galaxy, and other smaller galaxies. It is a barred spiral galaxy, with a bar-like structure formed by stars in its center. It is one of the few galaxies that can be seen with the naked eye, appearing as a milky blur. It is best visible in areas with clear skies, such as Ladakh or Spiti valley. Scientists believe the Andromeda Galaxy could be between 5 and 10 billion years old, but may not have taken its current form until two or three billion years ago. It was first mentioned in 965 CE by the Islamic astronomer al-Ṣūfī, and rediscovered in 1612 by the German astronomer Simon Marius. It is also known as Messier 31 or M31, and NGC 224