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

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 …

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 …

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.

This introductory astronomy textbook offers a comprehensive journey through the universe, beginning with foundational concepts and expanding outward to the farthest reaches of space …

Sep 29, 2025 · Earn 3 transferable credits with our online Astronomy 101: Intro to Astronomy (SDCM-0189) course featuring engaging video lessons, self-paced learning, and instructor …

You'll explore the basics of our universe, from planets and stars to galaxies and beyond. The course covers celestial mechanics, planetary systems, stellar evolution, and cosmology. You'll …

This course is designed for anyone who is interested in learning more about modern astronomy. We will help you get up to date on the most recent astronomical discoveries while also …

Discover the majesty and marvels of the stars, planets and other celestial objects in this free online astronomy course. Since ancient times, people have looked at the night sky and …

Discover a new way to learn astronomy with Intro to Astronomy. Explore this college-level Introduction to Astronomy course, and learn about the universe around us.