Galaxy

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Physical Realm
Universe Astronomical Instrument
Galaxy Milky Way, Andromeda
Planetary System Star, Brown Dwarf, Planet, Moon

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

Resources

These are organized by a classification scheme developed exclusively for Cosma. More…

General

Dictionary

galaxy : any of the very large groups of stars and associated matter that are found throughout the universe — Webster

OneLook, Free Dictionary, Wiktionary, Urban Dictionary

Thesaurus

Roget’s II (Thesaurus.com), Merriam-Webster Thesaurus, Visuwords

Encyclopedia

Galaxy is a massive, gravitationally bound system that consists of stars and stellar remnants, an interstellar medium of gas and dust, and an important but poorly understood component tentatively dubbed dark matter. Galaxies contain varying amounts of star systems, star clusters and types of interstellar clouds. In between these objects is a sparse interstellar medium of gas, dust, and cosmic rays. Dark matter appears to account for around 90% of the mass of most galaxies. — Wikipedia

Galactic Astronomy (Eric Weisstein’s World of Astronomy, Wolfram Research)
David Darling’s Internet Encyclopedia of Science

Introduction


Galaxy Introduction (Astronomy Online)

Search

Galaxies (Wolfram Alpha)

Preservation

History

Historical Overview of the Discovery of Galaxies (Earth Guide)
Timeline of knowledge about galaxies, clusters of galaxies… (Wikipedia)

Quotation

Quotations Page

Library

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

Participation

Education

What is a Galaxy? (Space Place, NASA)
Galaxies (Ask an Astronomer, Cornell University)
Galaxies (Cosmos4Kids)

Course





Crash Course Astronomy (YouTube)

OER Commons: Open Educational Resources

Community

News

Science Daily, Phys.org, NPR Archives

Book

ISBNdb

Government

Stars & Galaxies (NASA JPL)

Document

USA.gov

Poem

OEDILF: The Omnificent English Dictionary In Limerick Form

Music

Song Lyrics

returntotop

More…

Galaxies News -- ScienceDaily News and research on the formation of galaxies. From the Milky Way to Andromeda Galaxy, see astronomy images of splendid galaxies in the universe. Read the latest research discoveries.

  • Hubble finds best evidence for elusive mid-sized...
    on March 31, 2020 at 8:22 pm

    Astronomers have found the best evidence for the perpetrator of a cosmic homicide: a black hole of an elusive class known as 'intermediate-mass,' which betrayed its existence by tearing apart a wayward star that passed too close.

  • ALMA resolves gas impacted by young jets from...
    on March 27, 2020 at 3:37 pm

    Astronomers obtained the first resolved image of disturbed gaseous clouds in a galaxy 11 billion light-years away by using the Atacama Large Millimeter/submillimeter Array (ALMA). The team found that the disruption is caused by young powerful jets ejected from a supermassive black hole residing at the center of the host galaxy. This result will cast light on the mystery of the evolutionary process of galaxies in the early Universe.

  • Looking for dark matter close to home
    on March 26, 2020 at 6:44 pm

    Eighty-five percent of the universe is composed of dark matter, but we don't know what, exactly, it is.

  • Astronomers use slime mould to map the universe's...
    on March 26, 2020 at 4:41 pm

    The behaviour of one of nature's humblest creatures and archival data from the NASA/ESA Hubble Space Telescope are helping astronomers probe the largest structures in the Universe.

  • Expanding universe: We may be in a vast bubble
    on March 20, 2020 at 11:27 pm

    The few thousand galaxies closest to us move in a vast 'bubble' that is 250 million light years in diameter, where the average density of matter is half as large as for the rest of the universe. This is the hypothesis put forward by a theoretical physicist to solve a conundrum that has been splitting the scientific community for a decade: at what speed is the universe expanding?


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.

  • Astronomers perform variability study of the...
    on April 1, 2020 at 12:50 pm

    Chinese astronomers have conducted a gamma-ray and optical variability analysis of the blazar 3FGL J0449.4-4350. The new research, presented in a paper published March 25 on arXiv.org, reports the detection of possible quasi-periodic oscillation (QPO) from the source and provides more insights into the origin of such behavior.

  • Hubble finds best evidence for elusive mid-sized...
    on March 31, 2020 at 6:23 pm

    Astronomers have found the best evidence for the perpetrator of a cosmic homicide: a black hole of an elusive class known as "intermediate-mass," which betrayed its existence by tearing apart a wayward star that passed too close.

  • Warped space-time to help WFIRST find exoplanets
    on March 31, 2020 at 1:51 pm

    NASA's Wide Field Infrared Survey Telescope (WFIRST) will search for planets outside our solar system toward the center of our Milky Way galaxy, where most stars are. Studying the properties of exoplanet worlds will help us understand what planetary systems throughout the galaxy are like and how planets form and evolve.

  • Love in the time of coronavirus: How the pandemic...
    on March 31, 2020 at 11:49 am

    When Tinder issued an in-app public service announcement regarding COVID-19 on March 3 we all had a little laugh as a panoply of memes and gags hit the internet.

  • New method predicts which black holes escape...
    on March 31, 2020 at 7:50 am

    Shoot a rifle, and the recoil might knock you backward. Merge two black holes in a binary system, and the loss of momentum gives a similar recoil—a "kick"—to the merged black hole.