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
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.
- New treasure trove of globular clusters holds...on January 11, 2022 at 9:10 pm
A survey completed using a combination of ground and space-based telescopes yielded a treasure trove of previously unknown globular clusters—old, dense groups of thousands of stars that all formed at the same time—in the outer regions of the elliptical galaxy Centaurus A. The work presents a significant advance in understanding the architecture and cosmological history of this galaxy and offers new insights into galaxy formation in general and the distribution of dark matter in the […]
- Our galaxy's most recent major collisionon January 7, 2022 at 5:50 pm
One of the characteristic features of modern cosmology is its description of how galaxies evolve: via a hierarchical process of colliding and merging with other systems. Nowhere in the universe do we have a clearer view of this buildup than in our own Milky Way. Currently one of our nearby neighbors, the Sagittarius dwarf galaxy, is being tidally disrupted (a dwarf galaxy has less than about 1% of the stellar mass of a normal spiral galaxy like the Milky Way, and often much less). Two other […]
- The largest suite of cosmic simulations for AI...on January 7, 2022 at 2:51 pm
Totaling 4,233 universe simulations, millions of galaxies and 350 terabytes of data, a new release from the CAMELS project is a treasure trove for cosmologists. CAMELS—which stands for Cosmology and Astrophysics with MachinE Learning Simulations—aims to use those simulations to train artificial intelligence models to decipher the universe's properties.
- Hubble lends a helping handon December 22, 2021 at 2:38 pm
Far above rain clouds, light pollution, and atmospheric distortion, NASA's Hubble Space Telescope has a clear view of the universe. It has shown us distant galaxies, tracked interstellar objects as they soar through our solar system, and studied the atmospheres of planets that orbit other stars. In addition to its own stunning images and groundbreaking discoveries, Hubble uses its powerful vision to support many other past, ongoing, and future missions in space.
- Soon, 1 out of every 15 points of light in the...on December 1, 2021 at 12:28 pm
I'm outside at my rural Saskatchewan farm, chatting with my neighbors who I've invited over to appreciate the night sky through my telescope. After exclamations and open-mouthed wonder over Saturn's rings, and light that has been traveling through space for more than two million years to reach our eyes from the Andromeda Galaxy, our conversation inevitably turns to the pandemic, our work-from-home arrangements and complaints about rural internet. My neighbor casually mentions they've just […]
Here are links to pages about closely related subjects.
Solar System Sun
Terrestrial Planet Mercury, Venus, Earth (Moon), Mars
Asteroid Belt Ceres, Vesta
Jovian Planet Jupiter, Saturn, Uranus, Neptune
Kuiper Belt Pluto, Haumea, Makemake
Scattered Disc Eris, Sedna, Planet X
Oort Cloud Etc. Scholz’s Star
Small Body Comet, Centaur, Asteroid