Andromeda

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Introduction1

SEA (YouTube Channel)

Encyclopedia

Andromeda Galaxy, also known as Messier 31, M31, or NGC 224, is a spiral galaxy approximately 780 kiloparsecs (2.5 million light-years) from Earth, and the nearest major galaxy to the Milky Way. Its name stems from the area of the sky in which it appears, the constellation of Andromeda.

The 2006 observations by the Spitzer Space Telescope revealed that the Andromeda Galaxy contains approximately one trillion stars, more than twice the number of the Milky Way’s estimated 200 to 400 billion stars. The Andromeda Galaxy, spanning approximately 220,000 light-years, is the largest galaxy in our Local Group, which is also home to the Triangulum Galaxy and other minor galaxies. The Andromeda Galaxy’s mass is estimated to be around 1.76 times that of the Milky Way Galaxy (~0.8-1.5×1012 solar masses vs the Milky Way’s 8.5×1011 solar masses).

The Milky Way and Andromeda galaxies are expected to collide in ~4.5 billion years, merging to form a giant elliptical galaxy or a large disc galaxy. With an apparent magnitude of 3.4, the Andromeda Galaxy is among the brightest of the Messier objects — making it visible to the naked eye on moonless nights, even when viewed from areas with moderate light pollution. — Wikipedia

Andromeda (Encyclopædia Britannica)

Andromeda (Wolfram Alpha)

Library

Library of Congress # QB856 Galaxies (UPenn Online Books)

WorldCat, Library of Congress, UPenn Online Books, Open Library

Education

MERLOT: Multimedia Educational Resource for Learning and Online Teaching
OER Commons: Open Educational Resources

News

Andromeda (Astronomy Magazine)
Andromeda (Phys.org)
Andromeda (NPR Archives)

Government

Document

=Andromeda Galaxy (USA.gov)

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More News …

Phys.org - latest science and technology news stories Phys.org internet news portal provides the latest news on science including: Physics, Nanotechnology, Life Sciences, Space Science, Earth Science, Environment, Health and Medicine.

  • Colliding galaxies dazzle in Gemini North image
    on August 10, 2022 at 7:39 pm

    An evocative new image captured by the Gemini North telescope in Hawai'i reveals a pair of interacting spiral galaxies—NGC 4568 and NGC 4567—as they begin to clash and merge. These galaxies are entangled by their mutual gravitational field and will eventually combine to form a single elliptical galaxy in around 500 million years. Also visible in the image is the glowing remains of a supernova that was detected in 2020.

  • Cosmic radio pulses probe hidden matter around...
    on July 5, 2022 at 1:34 pm

    Powerful radio pulses originating deep in the cosmos can be used to study hidden pools of gas cocooning nearby galaxies, according to a new study appearing in the journal Nature Astronomy.

  • New fossil galaxy discovery could answer...
    on June 30, 2022 at 3:21 pm

    A new fossil galaxy, which was uncovered via a systematic visual search of legacy survey images using the Mayall 4-meter telescope, led by Dr. David Martinez Delgado, could teach scientists about how galaxies form and confirm their understanding of cosmology and dark matter.  

  • A giant black hole that spins slower than its...
    on June 30, 2022 at 3:18 pm

    Astronomers have made a record-breaking measurement of a black hole's spin, one of two fundamental properties of black holes. NASA's Chandra X-ray Observatory shows this black hole is spinning slower than most of its smaller cousins.

  • Formation and evolution of massive binaries may...
    on June 17, 2022 at 3:32 pm

    A research team led by Prof. Qian Shengbang and Ph.D. student Li Fuxing from the Yunnan Observatories of the Chinese Academy of Sciences has found that the formation and evolution of the massive binaries in the Milky Way and Andromeda Galaxy (M31) may share the same mechanism.

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Related

Here are links to pages about closely related subjects.

Knowledge Realm

Physical

“Fundamentals”
Law (Constant) Relativity
Force Gravity, Electromagnetism (Light, Color)
Matter (Microscope) Molecule, Atom (Periodic Table), Particle

“Space”
Universe (Astronomical Instrument)
Galaxy Milky Way, Andromeda
Planetary System Star, Brown Dwarf, Planet, Moon

Our Neighborhood
Solar System Sun
Terrestrial Planet Mercury, Venus, Earth (Moon), Mars
Asteroid Belt Ceres, Vesta
Jovian Planet Jupiter, Saturn, Uranus, Neptune
Trans-Neptunian Object
Kuiper Belt Pluto, Haumea, Makemake
Scattered Disc Eris, Sedna, Planet X
Oort Cloud Etc. Scholz’s Star
Small Body Comet, Centaur, Asteroid

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Notes

1.   The resources on this page are are organized by a classification scheme developed exclusively for Cosma.