Because the stars are the fundamental building blocks of the universe, decoding the message of starlight has been a central challenge and triumph of modern astronomy. By the time you have …

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 astronomical …

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.

Empowering the world's citizens to advance space science and exploration. Whether you’re spotting planets with the naked eye or finding galaxies with a telescope, there are lots of ways you can take in …

In the past, astronomy included disciplines as diverse as astrometry, celestial navigation, observational astronomy, and the making of calendars. Astronomy is one of the few sciences in which amateurs …

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

Feb 3, 2026 · The basics of astronomy explain how stars, planets, and galaxies form and change, offering insight into humanity’s place in the universe.

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 appear the way …

Explore the universe and learn how the solar system works in this astronomy course that explains how to measure celestial distances, spectrum analysis and more.

Jan 2, 2021 · Welcome to Introduction to Astronomy. Deep space remains one of the greatest mysteries, and our ever-present questions regarding the universe ensure that humankind continues to probe the …