Over time, the Milky Way has acquired a number of smaller satellite galaxies. These galaxies are thought to have been formed in the early universe, shortly after the Big Bang. As the Milky Way grew larger, it began to exert a gravitational pull on these smaller galaxies, eventually pulling them into orbit around itself.
Once a satellite galaxy becomes part of the Milky Way, it begins to be tidally disrupted by the Milky Way's gravity. This tidal disruption pulls stars and gas out of the satellite galaxy and spreads them out into a long, thin stream. Eventually, the satellite galaxy is completely destroyed and its stars and gas are incorporated into the Milky Way.
This process of tidal disruption is thought to be responsible for the death of many of the Milky Way's satellite galaxies. In fact, there are only about 50 satellite galaxies remaining in orbit around the Milky Way today. The rest have been completely destroyed by tidal disruption.
The tidal disruption of satellite galaxies is not a unique process. It is a common occurrence in galaxies throughout the universe. In fact, the Milky Way is thought to be one of the most aggressive galaxies in the Local Group when it comes to destroying its satellite galaxies.
The destruction of satellite galaxies is an important process because it helps to shape the structures of galaxies. Without this process, the Milky Way would be a much larger and more diffuse galaxy. Instead, it is a more concentrated galaxy with a well-defined shape.
