7. Sally was trying to create a model that represents the composition of a galaxy. In her model, she needs to distinguish galaxies from other systems of celestial objects. Which of the following best describes the composition of a galaxy?

Dust, gases, billions of stars, and solar systems

Explanation:

A galaxy is a large group of dust, inter stellar gas, stars, solar systems, stellar remnants, dark matter. Some galaxies have over several billions of stars.

Small galaxies are known as dwarfs, which contain a few hundred million stars while large galaxies are known as giants which contain up to a hundred trillion stars

Therefore, the correct option is dust, gases, billions of stars, and solar systems

answer

procedural programming, object-oriented programming

explanation

procedural programming is a type of computer programming language that specifies a series of well structured steps and procedures   within its development period of time. it contains a systematic order of statements, functions and commands to complete a computational task or program. it is centered on creating procedures. while object oriented programming is a programming language that is centered on creating objects rather that actions and data rather than logic.. it has four principles which are inheritance, polymorphism, abstraction and encapsulation