A decade of observations by NASA’s Hubble Space Telescope has produced the sharpest and most detailed images of the Andromeda galaxy. Zoom in and explore.

Test your knowledge of U.S. astronomers and their groundbreaking discoveries. Challenge yourself with this fun US astronomers ...

The Andromeda galaxy is the galaxy next door, a very faint, fuzzy thing in the night sky, larger than a full moon. Textbooks ...

Our galaxy may reside in a billion-light-year-wide cosmic bubble that accelerates local expansion, potentially settling the ...

For the photographers honored at the 2025 Astronomy Photographer of the Year awards, the universe is their muse. From our fiery sun to dazzling aurorae, and a sparkling Milky Way to captivating ...

Earth and the entire Milky Way galaxy might be sitting inside an enormous, mysterious void—a giant cosmic hole making our universe expand faster right here than anywhere else. This unusual idea, ...

Danish astronomer Ejnar Hertzsprung realized the tremendous significance ... and calibrated Leavitt's graph with absolute magnitudes. When Edwin Hubble discovered a Cepheid within the so-called ...

A cosmic void could be distorting how we see the universe expand. Sound from the Big Bang may hold the clues. According to ...

Earth and our entire Milky Way galaxy may sit inside a mysterious giant hole which makes the cosmos expand faster here than ...

One amateur astronomer is on a quest to identify every object in the catalog of Lynds’ dark nebulae. Tag along for the ...

Planetariums were a hit with the public. Within decades, they had spread around the world – the first planetarium in the ...