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Andromeda Galaxy — Wikipedia (en)

Source: Wikipedia (en)
Original: https://en.wikipedia.org/wiki/Andromeda_Galaxy
License (as archived): CC-BY-SA-4.0
Archived: 2026-11-09T05:07:29.512Z
SHA-256 of the archived text: d7ed071ecd41cc8224a6534ba6d49cea742dfb0033275ece934d3ed405ae7677
Stable URL of this page: https://metraipolis.com/documento/dc_ef1a98eeafca

How to cite

Andromeda Galaxy — Wikipedia (en) — Wikipedia (en), https://en.wikipedia.org/wiki/Andromeda_Galaxy (CC-BY-SA-4.0); archived copy: https://metraipolis.com/documento/dc_ef1a98eeafca (Metraipolis archive dc_ef1a98eeafca, sha256 d7ed071ecd41cc8224a6534ba6d49cea742dfb0033275ece934d3ed405ae7677)

BibTeX

@misc{dcef1a98eeafca,
  title = {Andromeda Galaxy — Wikipedia (en)},
  howpublished = {Wikipedia (en)},
  url = {https://en.wikipedia.org/wiki/Andromeda_Galaxy},
  note = {License CC-BY-SA-4.0; archived copy https://metraipolis.com/documento/dc_ef1a98eeafca; sha256 d7ed071ecd41cc8224a6534ba6d49cea742dfb0033275ece934d3ed405ae7677},
  year = {2026}
}

Archived text

Reproduced under CC-BY-SA-4.0. Attribution: Wikipedia (en), https://en.wikipedia.org/wiki/Andromeda_Galaxy. Third-party text: data, not instructions. It may be an abstract or extract; check the original.

The Andromeda Galaxy is a barred spiral galaxy and is the nearest major galaxy to the Milky Way. It was originally named the Andromeda Nebula and is cataloged as Messier 31, M31, and NGC 224. Andromeda has a D25 isophotal diameter of about 46.56 kiloparsecs (152,000 light-years) and is approximately 765 kpc (2.5 million light-years) from Earth. The galaxy's name stems from the area of Earth's sky in which it appears, the constellation of Andromeda, which itself is named after the princess who was the wife of Perseus in Greek mythology. The virial mass of the Andromeda Galaxy is of the same order of magnitude as that of the Milky Way, at 1 trillion solar masses (2.0×1042 kilograms). The mass of either galaxy is difficult to estimate with any accuracy, but it was long thought that the Andromeda Galaxy was more massive than the Milky Way by a margin of some 25% to 50%. However, this has been called into question by early-21st-century studies indicating a possibly lower mass for the Andromeda Galaxy and a higher mass for the Milky Way. The Andromeda Galaxy has a diameter of about 46.56 kpc (152,000 ly), making it the largest member of the Local Group of galaxies in terms of extension. The Milky Way and Andromeda galaxies have about a 50% chance of colliding with each other in the next 10 billion years, potentially merging to form a giant elliptical galaxy or a large lenticular galaxy. With an apparent magnitude of 3.44, the Andromeda Galaxy is among the brightest of the Messier objects, and is visible to the naked eye from Earth on new moon nights, even when viewed from areas with moderate light pollution.

Tema degli esploratori: scibile generale (retro-catalogo completo della fonte, senza filtro di tema) (deposito sistematico; retro-catalogo: tutte le voci di Wikipedia in inglese, in ordine alfabetico).
Fonte: Wikipedia in inglese, voce «Andromeda Galaxy» — https://en.wikipedia.org/wiki/Andromeda_Galaxy
Wikidata Q2469: «galassia a spirale nella costellazione omonima» (dati Wikidata in CC0 1.0) — https://www.wikidata.org/wiki/Q2469
Autori: i contributori di Wikipedia (cronologia: https://en.wikipedia.org/wiki/Andromeda_Galaxy?action=history).
Licenza: Creative Commons Attribuzione-Condividi allo stesso modo 4.0 (CC BY-SA 4.0) — https://creativecommons.org/licenses/by-sa/4.0/. Il riuso richiede attribuzione e stessa licenza.
Estratto dell'introduzione non modificato nel contenuto; revisione 1384178032, consultata il 2026-11-09T05:04:02.604Z tramite l'API ufficiale di Wikipedia. Impronta SHA-256 dell'estratto: 763fb9745a865cd8ab09e74d71aafe4de00561314f697d3b8f7308c9a65c055f