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Astronomy - Wikipedia
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 play an active role. This is especially true for the discovery and observation of transient events.

Astronomy Magazine: Space News, Observing, Planets, Galaxies
Astronomy.com is for anyone who wants to learn more about astronomy and space, including planets, galaxies, asteroids, and NASA.

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

Astronomy - NASA
NASA Continues to Study Pulsars, 50 Years After Their Chance Discovery

What Is Astronomy? Definition, Branches & Examples
Astronomy is the scientific study of objects and phenomena beyond Earth’s atmosphere, including stars, planets, moons, galaxies, black holes, and the universe as a whole.

Astronomy: Everything you need to know | Space
Astronomy is one of the oldest scientific disciplines. Explore what it is and how it's shaped our understanding of the world around us in our ultimate guide.

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 .

Astronomy | Science News
Uneven supernova explosions may explain the unusual mix of elements in Milky Way stars once thought to be evidence of hypernovas. Ancient meteorites reveal a powerful magnetic field that may have...

Astronomy 101 | Free Astronomy Courses, Space Science & Learning Platform
You can learn about astronomy, rocket science, astrobiology, stars, planets, galaxies, constellations, the solar system, cosmic phenomena, and the latest discoveries in space science — all explained in simple language with visuals and examples.

AstronomyTrek: Explore Space, Stars & the Night Sky
Explore the Solar System, stars, constellations, galaxies and the night sky with clear astronomy guides, fascinating facts and space science.