A galaxy is a massive cloud of gas and dust that contains billions of stars and their solar systems. What holds all those things together?

Gravity is a critical force in the universe. Because space objects have a gravitational attraction to one another, gravity has an effect on the paths taken by everything moving through space. It is the glue that binds whole galaxies together and maintains the orbits of planets.

Asked by Vasilii Kulev · Last updated 4 years ago · 2.5K views · SOURCE