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  1. Ch. 1 Introduction - Astronomy 2e | OpenStax

    This free textbook is an OpenStax resource written to increase student access to high-quality, peer-reviewed learning materials.

  2. Introduction to Astronomy | Physics | MIT OpenCourseWare

    Introduction to Astronomy provides a quantitative introduction to the physics of the solar system, stars, the interstellar medium, the galaxy, and the universe, as determined from a variety of …

  3. Astronomy 101: The Basics of Learning Astronomy - ThoughtCo

    May 6, 2025 · Learn the basics of astronomy and how it helps scientists understand everything from planets and moons to galaxies and the structure of the universe.

  4. Introduction to Astronomy (Lumen) - Physics LibreTexts

    This textbook offers a broad introduction to astronomy, covering the structure and scale of the universe, the history of astronomical discovery, the motions of celestial bodies, light and …

  5. Astronomy | Definition, History, Discoveries, & Facts | Britannica

    Nov 14, 2025 · Astronomy, science that encompasses the study of all extraterrestrial objects and phenomena. Since the late 19th century, astronomy has expanded to include astrophysics, the …

  6. What is Astronomy? | AMNH

    Astronomy is the study of everything in the universe beyond Earth’s atmosphere. That includes objects we can see with our naked eyes, like the Sun , the Moon , the planets, and the stars .

  7. Introduction to Astronomy

    Nov 26, 2021 · In the following chapters you will learn how astronomers measure the distances, sizes, and ages of these objects and determine what they are like and what makes them …

  8. Module IntroductionIntroduction to Astronomy

    Astronomy is a passion for many and today is a mainstream hobby, as in years past. Introduction to Astronomy will provide you with an opportunity to explore both the significant historical …

  9. Astronomy for Beginners - The Planetary Society

    Here are a few tips to get you started with astronomy for beginners, and some ways to deepen your connection to the cosmos. Some locations are better than others for stargazing, but you …

  10. Introduction to Astronomy | Department of Astronomy | Illinois

    Introduces the student to the basic concepts of modern astronomy.