The movement of objects in outer space is primarily influenced by the force of gravity. Gravity is a fundamental force of nature that attracts objects with mass towards each other. Objects in space, such as planets, moons, asteroids, and comets, are influenced by the gravitational pull of larger objects like stars, galaxies, and black holes.
The force of gravity causes celestial objects to move in specific patterns. For example, planets orbit around stars, moons orbit around planets, and artificial satellites orbit around the Earth. These motions are governed by the balance between the gravitational force pulling the objects inward and the inertia of the objects trying to move in a straight line.
While gravity is the dominant force shaping the movement of objects on smaller scales, the expansion of the universe also plays a role on much larger scales. The expansion of the universe is a fundamental property of our universe, where space itself is expanding between distant galaxies. However, it's important to note that this expansion is not the main driving force behind the movement of objects within galaxies or within the gravitational pull of larger objects. Gravity remains the dominant force on those scales.
In summary, the movement of objects in outer space is primarily governed by the force of gravity, which is responsible for the orbital motions and interactions between celestial bodies. The expansion of the universe affects the overall structure and distribution of galaxies on much larger scales, but on smaller scales, gravity is the primary force at play.