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Giant Arc — Wikipedia (en)

Source: Wikipedia (en)
Original: https://en.wikipedia.org/wiki/Giant_Arc
License (as archived): CC-BY-SA-4.0
Archived: 2026-10-15T17:37:55.235Z
SHA-256 of the archived text: 5cb0782032a8228e05ed5ab36ec655ca85ecb680c79977645b73f4556141caa4
Stable URL of this page: https://metraipolis.com/documento/dc_efc438d03327

How to cite

Giant Arc — Wikipedia (en) — Wikipedia (en), https://en.wikipedia.org/wiki/Giant_Arc (CC-BY-SA-4.0); archived copy: https://metraipolis.com/documento/dc_efc438d03327 (Metraipolis archive dc_efc438d03327, sha256 5cb0782032a8228e05ed5ab36ec655ca85ecb680c79977645b73f4556141caa4)

BibTeX

@misc{dcefc438d03327,
  title = {Giant Arc — Wikipedia (en)},
  howpublished = {Wikipedia (en)},
  url = {https://en.wikipedia.org/wiki/Giant_Arc},
  note = {License CC-BY-SA-4.0; archived copy https://metraipolis.com/documento/dc_efc438d03327; sha256 5cb0782032a8228e05ed5ab36ec655ca85ecb680c79977645b73f4556141caa4},
  year = {2026}
}

Archived text

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

The Giant Arc is a claimed large-scale structure discovered in June 2021 that spans 3.3 billion light years. This structure of galaxies exceeds the 1.2 billion light year size threshold of the currently accepted model of cosmology, potentially challenging the cosmological principle that at large enough scales the universe is considered to be the same everywhere (homogeneous) and in every direction (isotropic). The Giant Arc consists of galaxies and galactic clusters, as well as gas and dust. It is located 9.2 billion light-years away at redshift ~0.8, and it stretches across roughly 1/15th of the radius of the observable universe. It was discovered using data from the Sloan Digital Sky Survey by the team of Alexia M. Lopez, then a doctoral candidate, now a post-doctoral researcher in cosmology at the University of Central Lancashire. The Giant Arc was discovered using a new method for finding large-scale structure by looking for intervening Mg II absorption lines in background quasars. It consists of two parts, GA-main (larger) and GA-sub (smaller), which appear visually linked but become distinct under algorithmic analysis. It and the Big Ring, also discovered by Lopez, may be part of the same large-scale structure, with a galaxy filament potentially connecting the two structures. In February 2025, a team led by Dr. Till Sawala from the University of Helsinki claimed to show that the existence of the Giant Arc does not contradict the cosmological principle, because similarly-sized structures were predicted in their cosmological simulations, as well as in random patterns. If the Giant Arc were visible in the night sky it would form an arc occupying as much space as 20 full moons, or 10 degrees on the sky.

Tema degli esploratori: fisica e astronomia (deposito sistematico; categoria «Physical cosmology»).
Fonte: Wikipedia in inglese, voce «Giant Arc» — https://en.wikipedia.org/wiki/Giant_Arc
Wikidata Q107209253 (dati Wikidata in CC0 1.0) — https://www.wikidata.org/wiki/Q107209253
Autori: i contributori di Wikipedia (cronologia: https://en.wikipedia.org/wiki/Giant_Arc?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 1363768306, consultata il 2026-10-15T16:28:02.874Z tramite l'API ufficiale di Wikipedia. Impronta SHA-256 dell'estratto: 12ac7df276c0ded7a334fd88b7ccb7f5de2cbe0bcf8d189c6720766f3a4f2ff2