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Loading contentThe nearest large spiral galaxy to the Milky Way and the most distant object readily visible to the naked eye.
galaxy:andromeda-galaxyDataset membership
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In the graph export: graph.json · graph.jsonld
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The Andromeda Galaxy (M31) is the nearest large spiral galaxy to the Milky Way, about 2.5 million light-years away, and is approaching the Milky Way for a future merger.
Source: NASA Science · Public domain (US Government work)
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Real, source-backed references — primary papers first, then datasets and institutional sources. Formatted through the citation engine; nothing is fabricated.
Vera C. Rubin & W. Kent Ford Jr. · The Astrophysical Journal 159, 379 · 1970
The Astrophysical Journal · doi:10.1086/150317
Vera C. Rubin & W. Kent Ford Jr. (1970). Rotation of the Andromeda Nebula from a Spectroscopic Survey of Emission Regions. The Astrophysical Journal 159, 379. The Astrophysical Journal. https://doi.org/10.1086/150317
@misc{cite:rubin-ford-1970,
title = {Rotation of the Andromeda Nebula from a Spectroscopic Survey of Emission Regions},
author = {Vera C. Rubin and W. Kent Ford Jr.},
organization = {The Astrophysical Journal},
howpublished = {The Astrophysical Journal 159, 379},
year = {1970},
doi = {10.1086/150317},
url = {https://doi.org/10.1086/150317},
note = {Andromeda rotation curve — evidence for dark matter.}
}NASA/IPAC (Caltech)
NASA/IPAC (Caltech) (n.d.). Andromeda Galaxy (M31) — NASA/IPAC Extragalactic Database. NASA/IPAC (Caltech). https://ned.ipac.caltech.edu/
@misc{cite:ned-galaxy-andromeda-galaxy,
title = {Andromeda Galaxy (M31) — NASA/IPAC Extragalactic Database},
organization = {NASA/IPAC (Caltech)},
year = {n.d.},
url = {https://ned.ipac.caltech.edu/},
note = {Positions, redshift, and cross-identifications for Andromeda Galaxy (M31).}
}How Andromeda Galaxy connects across Asteria Star — scientific, cultural, and astrological links are kept separate.
A pair of 8.1-metre optical/infrared telescopes, one in Hawaii and one in Chile, giving coverage of both hemispheres.
The barred spiral galaxy that contains the Solar System, the Sun, and all stars visible to the naked eye.
Palomar Observatory is an astronomical observatory in California, home to the historic 200-inch Hale Telescope.
Abd al-Rahman al-Sufi, known in Latin as Azophi, revised Ptolemy's star catalogue against his own observations in his Book of Fixed Stars.
Edwin Hubble was an American astronomer whose observations established that the universe is expanding and that galaxies lie far beyond the Milky Way.
An American astronomer whose study of galaxy rotation curves provided strong evidence for dark matter.
Using Cepheid distances and galaxy redshifts, Edwin Hubble showed in 1929 that galaxies recede faster the farther away they are — the universe is expanding, as Lemaître had derived two years earlier.
In 1920 Harlow Shapley and Heber Curtis debated the scale of the universe: whether the spiral nebulae lie within the Milky Way or are separate 'island universes'.
A flattened, rotating disk of stars, gas, and dust wound into spiral arms, with a central bulge. The arms are where new stars form, tracing waves of star formation sweeping through the disk.
The gravitationally-bound group of galaxies the Milky Way belongs to — dominated by the Milky Way and Andromeda, with the Triangulum galaxy and dozens of dwarfs. Andromeda and the Milky Way are approaching, and will merge in a few billion years.
The Milky Way and the Andromeda Galaxy are approaching each other and are predicted to merge into a single elliptical galaxy in roughly four to five billion years, though the exact timing and geometry remain uncertain. Stars will almost never collide, but both discs will be transformed as the two giants of the Local Group become one.
A map of the catalogued deep-sky objects — galaxies, nebulae, and star clusters — drawn from their measured right ascension and declination, with symbols scaled by angular size. The wider sky beyond the naked-eye stars.
An explorer of our galactic neighbourhood — the Milky Way, Andromeda, Triangulum, the Magellanic Clouds, and the dozens of dwarf galaxies bound with them into the Local Group. Prepared for a three-dimensional map of the nearby universe.
A browsable index of catalogued galaxies — spirals, ellipticals, and irregulars — organised by morphology and distance. The building blocks of cosmic structure, each linked to its place in the knowledge graph.
An explorer of cosmic distance and scale — from the nearest stars to the edge of the observable universe — built on the rungs of the cosmic distance ladder. Prepared to visualise the vast, logarithmic reach of the cosmos honestly, with distances drawn only from measured indicators.
Our galactic neighbourhood — the Milky Way, Andromeda, Triangulum, the Magellanic Clouds, and the dozens of dwarf galaxies bound with them. The members and their relationships are drawn from the graph; their separations are given by the catalogue's descriptive scale labels, because numeric inter-galactic distances and positions are not part of the data.
Barred spiral galaxy in Corvus, magnitude 10.2.
Barred spiral galaxy in Corvus, magnitude 11.04.
Irregular galaxy in Sagittarius, magnitude 10.05.
Barred spiral galaxy in Lynx, magnitude 11.71.
Spiral galaxy in Virgo, magnitude 10.8.
Spiral galaxy in Virgo, magnitude 11.32.
Facts on this topic will be cited from these primary and reference sources.
Mission data, planetary science, space telescopes, and public-domain imagery.
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European missions, observatories, and space science imagery.
Official naming, definitions, constellation boundaries, and astronomical nomenclature.