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  1. 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 …

  2. Astronomy - Wikipedia

    Astronomy is a natural science that studies celestial objects and the phenomena that occur in the cosmos. It uses mathematics, physics, and chemistry to explain their origin and their overall …

  3. 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 .

  4. What is Astronomy? | Tucson Amateur Astronomy Association

    What is Astronomy? Astronomy is the scientific study of celestial objects (such as stars, planets, comets, nebulae, star clusters and galaxies) and phenomena that originate outside the Earth’s …

  5. What Is Astronomy? A Beginner’s Guide to Looking Up

    May 15, 2025 · Astronomy is the study of everything beyond Earth's atmosphere. That includes the Moon, planets, stars, galaxies, black holes, and even the stuff we can't see - like dark matter.

  6. Astronomy: Everything you need to know | Space

    Jul 25, 2023 · Astronomy is the scientific study of the universe using mathematics, physics, and chemistry.

  7. What exactly is astronomy? - American Astronomical Society

    Astronomy is a physical science concerned with the smallest particles and the largest natural objects. The name Astronomy comes from the Greek roots Astr- and -nomia to literally mean …

  8. What is Astronomy? | Department of Astronomy

    What is Astronomy? Astronomy and Astrophysics is the study of planets, stars, galaxies, and the Universe as a whole. This includes how all of these originate and their evolution in time.

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

    May 6, 2025 · Astronomy is the study of the universe, starting with stargazing and observing celestial bodies. Professional astronomers study stars, planets, and galaxies to understand the …

  10. Introduction to Astronomy / What is Astronomy? - 101.school

    Astronomy is a fascinating field of study that has captivated humanity's curiosity for thousands of years. But what exactly is astronomy? Simply put, astronomy is the scientific study of celestial …