Answer:
The correct option is B. a system of stars held by gravitational attraction.
Explanation:
Astronomical objects are all extensive objects that are part of the universe, which can interact with another body by the law of gravity (orbiting it or being orbited), or also if there are no forces that influence it, it remains as a wandering body In the middle of space. For example, some types of celestial objects can be planets, asteroids, natural satellites, stars, etc.
