This image of the Andromeda Galaxy, captured by the Herschel Space Observatory, reveals a detailed view of cool lanes of star formation.

In 1920, astronomers Harlow Shapley and Heber Curtis held a Great Debate. Shapley argued that the spiral nebulae were small and in the Milky Way, while Curtis took a more radical position that they ...

Astronomers refer to the Andromeda Galaxy as M31 because it is the 31st object listed in the Messier Catalog, a list of astronomical objects compiled by French astronomer Charles Messier.

The Panchromatic Hubble Andromeda Southern Treasury. I. Ultraviolet and Optical Photometry of over 90 Million Stars in M31, The Astrophysical Journal (2025). DOI: 10.3847/1538-4357/ad7e2b ...

The Milky Way has a 50-50 chance of colliding with a nearby galaxy in the next 10 billion years, a new study finds. Yet while those odds appear daunting, the new finding suggests the catastrophic ...

Before then, the orthodox cosmological view was that the Milky Way encompassed the entire known universe, and that Andromeda had to be part of it as a result. Hubble's estimate that M31 was 2.5 ...

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The Panchromatic Hubble Andromeda Southern Treasury. I. Ultraviolet and Optical Photometry of over 90 Million Stars in M31." Researchers at the University of Washington presented their findings at ...

But only one galaxy stands out as the most important nearby stellar island to our Milky Way -- the magnificent Andromeda galaxy (Messier 31). It can be seen with the naked eye on a very clear ...

Under the right conditions, you can even see Andromeda (also known as M31) with the naked eye. In addition, it may be home to upward of 1 trillion stars, many of which are close to the telescope's ...

It is a panoramic view of the neighboring Andromeda galaxy, located 2.5 million light-years away. It took over 10 years to make this vast and colorful portrait of the galaxy, requiring over 600 ...