Seeing two galaxy merging together has again brought up the question of how exactly the galaxies are formed. In the very initial phase, the galaxies were just tiny dwarfs that clumped together to form larger galaxies which are there today. This is also known as hierarchical formation, which means that galaxy formation is a step-by-step process in which smaller galaxies are pulled together due the gravitational force between them.
Recent discovery has shown that led to rethinking of this theory as it suggests that the dwarf galaxies merge into larger ones a lot faster than it was originally being thought. This has led to the confusion of the formation of galaxies arising again and leaving the researchers confused and making them look back to 13 billion years ago, when all this actually started.
Written By- Srishti Anand