Ontario Grade 9 Science Class Practice Exam 2025 – Your Complete Guide to Exam Success!

Question: 1 / 400

What does astronomy study?

The planet Earth

The universe

Astronomy is the study of celestial objects and phenomena that exist outside of Earth's atmosphere, including planets, stars, galaxies, and the universe as a whole. While Earth is a component of the universe, it is not the sole focus of astronomy. Option A is incorrect because Earth is not the only object studied in astronomy. Option C is incorrect because astronomy extends beyond just the solar system. Option D is incorrect because it pertains to the study of Earth's oceans, which is not related to astronomy. Thus, option B is the most accurate answer.

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Only the solar system

The ocean depths

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