"Astronomy" and "astrophysics" are broadly synonymous in modern usage. [3][4][5] In dictionary definitions, "astronomy" is "the study of objects and matter outside the Earth's atmosphere and of …

Feb 11, 2026 · Astronomy, science that encompasses the study of all extraterrestrial objects and phenomena. Since the late 19th century, astronomy has expanded to include astrophysics, the …

Feb 9, 2026 · Astronomy.com is for anyone who wants to learn more about astronomy events, cosmology, planets, galaxies, asteroids, astrophotography, the Big Bang, black holes ...

1 day ago · A different astronomy and space science related image is featured each day, along with a brief explanation.

1 day ago · Astronomy news. New! Earth-like extrasolar planet found; double helix nebula; supermassive black holes, astronomy articles, astronomy pictures. Updated daily.

Huge distances, gigantic sizes, and long periods of time—astronomy is a BIG subject. We've brought learning about it down to size with this look at the big ideas you need to know.

Jul 25, 2023 · Astronomy was born out of humankind's ancient fascination with the star-studded sky.

3 days ago · Astronomy Galaxies with ‘hoop skirts’ are more common than we thought The discovery of thousands more galaxies with stars ringing their main disks could help astronomers study galactic ...

1 day ago · Your daily source for space and astronomy news. Expert coverage of NASA missions, rocket launches, space exploration, exoplanets, and the latest discoveries in astrophysics.

The meaning of ASTRONOMY is the study of objects and matter outside the earth's atmosphere and of their physical and chemical properties. The Difference Between Astronomy and Astrology