How do gravity and dark matter shape the galaxies and affect their environment?

Here is the answer of the given question above. Gravity and dark matter shape the galaxies and how this affects their environment since the dark matter holds galaxies together and gives them their spin and adds to their mass. Both gravity and dark matter shape the galaxies and decide their form. The force of gravity is responsible for pulling other celestial objects and stars inwards to the center of the galaxy, making them more organized in structure.