The factor that primarily determines the gravity of a star is its mass. The more massive a star is, the stronger its gravitational pull.
Gravity is a fundamental force of nature that arises due to the mass of an object. The greater the mass of an object, the more gravitational force it exerts on other objects. In the case of a star, its mass determines the strength of its gravitational field.
The gravitational force of a star plays a crucial role in holding it together and determining its structure and behavior. It counteracts the internal pressure generated by nuclear fusion reactions occurring in the star's core, allowing it to maintain a stable equilibrium.
It's worth noting that the density of a star also affects its gravity to some extent. Density is the mass of a star divided by its volume. Stars with a higher density tend to have a stronger gravitational field because their mass is more concentrated within a smaller volume.
In summary, the primary factor determining the gravity of a star is its mass, while density also has some influence on the strength of its gravitational field.