Question

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a(n) ________ is an organized system of millions or billions of stars, gas, solar systems, and dust that are held together by gravitational attraction.

friction
albedo
galaxy

Explanation:

The definition describes a large, gravitationally bound system of stars, gas, dust, and solar systems. "Friction" is a force between surfaces, "albedo" is a measure of reflectivity, while "galaxy" matches the given definition perfectly.

Answer:

galaxy