Ontario Grade 9 Science Class Practice Exam

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Master Grade 9 Science with our comprehensive practice exam. Test your knowledge, identify weak areas, and boost your confidence for academic success.

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What is a galaxy?

A single star
A small group of stars
A huge group of single stars, star systems, star clusters, dust, and gas bound together by gravity
A satellite of Earth

The correct answer is: A huge group of single stars, star systems, star clusters, dust, and gas bound together by gravity

A galaxy is not a single star (A) or a small group of stars (B), as galaxies typically contain billions of stars. It is also not a satellite of Earth (D), as galaxies are much larger and are not orbiting Earth. The correct definition of a galaxy is a huge group of single stars, star systems, star clusters, dust, and gas bound together by gravity (C). This definition encompasses the vast size and complexity of galaxies.