The force that keeps the stars in a galaxy together is gravity. Gravity is the attractive force between objects with mass. In a galaxy, the combined mass of all the stars, planets, gas, dust, and other objects creates a gravitational force that holds everything together.
Here's why gravity is the key force at play in this context:
1. **Gravity**: The mass of stars and other celestial bodies within a galaxy exerts a gravitational pull on each other. This gravitational force is what keeps the stars in their orbits around the center of the galaxy.
2. **Balance**: The gravitational force between stars is balanced by their outward motion, often caused by the rotational force of the galaxy. This balance between gravity and motion helps maintain the structure of the galaxy.
3. **Galactic Center**: In many galaxies, including our Milky Way, there is a supermassive black hole at the center. While black holes play a role in the dynamics of galaxies, the overall gravitational force that holds the galaxy together is due to the collective mass of all its components.
So, in summary, while rotational force and black holes do have roles in galaxies, gravity is the fundamental force that keeps the stars in a galaxy together by exerting an attractive force between them.
