Massive galaxies similar to our Milky Way were formed by engulfing smaller galaxies. However, it requires a nucleus as a center and the nucleus of the galaxy might soon get revealed.
The surrounding galaxies around are not as large in comparison to the magnitude order. It can be argued that only Andromeda might be closer in size to Milky Way within the local galaxy group.
The Nucleus Of The Milky Way
Our Milky Way galaxy achieved this huge magnitude by engulfing several small galaxies. The space telescope of GAIA has made it possible for us to recognize common origin stars. The telescope captured these stars through their ages as well as movements. Ultimately, it has been revealed several of these star conglomerations have been consumed by the Milky Way to form this enormous galaxy.
Along with this conglomeration, the galaxy also had an original group of stars from the very beginning, and finding that was a task. Professor Hans Walter Rix from Max Plank Astronomy Institute with others has been peer reviewing new papers to find it.
The Original Story
One big obstacle is that the original star group is almost aged 12.5 billion years. Additionally, these stars are of low mass since gigantic stars like the Sun usually don’t survive long. Stars must also be positioned at the heart of their galaxy but the Sagittarius constellations have many events happening at the same time.
Rix informed that center stars have poor metal reception and are composed of helium and hydrogen. Smaller stars are created prior to explosions with the help of the metals dispersed around. 0.2% of the mass of the Milky Way belongs to the original star set but authors are unable to identify later mergers. “The Poor Old Heart of the Milky Way” garnered widespread praise from around the world.