Astronomy is a natural science that studies celestial objects and the phenomena that occur in the cosmos. It uses mathematics, physics, and chemistry in order to explain their origin and their overall evolution. Objects of interest include planets, moons, stars, nebulae, galaxies, meteoroids, asteroids, and comets.

Astronomy, science that encompasses the study of all extraterrestrial objects and phenomena. Since the late 19th century, astronomy has expanded to include astrophysics, the application of physical and chemical knowledge to an understanding of the nature of celestial objects.

Learn about the history, types, and challenges of astronomy, the scientific study of the universe. Explore the origins, structure, and evolution of celestial objects and phenomena with Space.com.

The best guide to astronomy for beginners is the night sky. All you really need to do to get started is look up — preferably at night! You'll find an amazing treasure chest of astronomical wonders, even if you don't have a telescope.

Learn the basics of astronomy, the study of everything in the universe beyond Earth's atmosphere. Discover the big ideas of astronomy, such as patterns, distances, motion, gravity, light, and invisible stuff.

Sky & Telescope covers the latest night-sky events, astronomy news, astrophotography and observing tips. Learn more with our tools, videos, and podcasts.

Astronomy - NASA. NASA Knows – How Can I Get Involved With NASA Research? From Campus to Cosmos: NASA Grants Boost Student, University Innovation. Still Kickin’ Since the ’70s: NASA’s Voyager Mission Keeps Exploring.

Astronomy Picture of the Day Discover the cosmos! Each day a different image or photograph of our fascinating universe is featured, along with a brief explanation written by a professional astronomer.

Keep up to date with the latest astronomy news, the newest astronomical discoveries, and the hottest tips for observing celestial happenings.