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

the independent variable, the one that is intentionally manipulated, is whether or not the car hits the barrier.

the dependent variable, the one that you measure the response in, is the distance that the washers travel.

hello there!

your answer is a “generator”

a generator does not create energy but instead it transforms it.

it’s basically a motor working in reverse.