Milky Way Collided with Dwarf Galaxy 10 Billion Years Ago

Researchers at Durham University have made a groundbreaking discovery that sheds new light on the formation of the Milky Way galaxy. According to their findings, the Milky Way was involved in a catastrophic collision with a dwarf galaxy known as the Gaia Sausage approximately 10 billion years ago. This event, which occurred long before the solar system was formed, had a profound impact on the galaxy's structure, causing it to be flipped on its side.

The Gaia Sausage, a small galaxy that was once part of the Milky Way, is believed to have been ejected from the galaxy due to the gravitational forces exerted during the collision. The researchers used data from the Gaia spacecraft, which has been mapping the galaxy's stars and their movements since its launch in 2013, to identify the signature of the Gaia Sausage's presence. By analyzing the stars' velocities and positions, they were able to recreate the galaxy's past and confirm the existence of the cataclysmic event.

This discovery has significant implications for our understanding of the Milky Way's evolution and its current structure. The collision with the Gaia Sausage is believed to have played a crucial role in shaping the galaxy's spiral arms and the distribution of its stars. As researchers continue to study the Milky Way and its history, this new finding provides valuable insights into the complex and dynamic processes that have shaped our galaxy over billions of years.