Galaxy

Cosma / Communication / Knowledge / Realm / Physical / Universe / Galaxy
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galaxy : any of the large groups of stars and associated matter that are found throughout the universe — Merriam-Webster See also OneLook

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

Galaxy (Encyclopædia Britannica)

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Inspiration

Astrum (YouTube Channel)
Astrum (Facebook Page)

Hubble Skymap puts the night sky at your fingertips any time of day. Roam the Milky Way to find a selection of stars and nebulae as seen by Hubble. To explore the skymap, scroll, double click, or pinch/swipe to zoom in and out. Roll over an icon to see the object, click to zero in, and click again for a detailed view and a description. Drag the map to navigate. — Hubble Skymap (NASA Science)

Hubble Skymap (NASA Science)

Hubble’s Galaxies is a collection of galaxy images from the Hubble Space Telescope — Hubble’s Galaxies

Hubble’s Galaxies (NASA Science)

Big Idea 9: There are Hundreds of Billions of Galaxies in the Universe (Big Ideas in Astronomy, International Astronomical Union)

Talks about Galaxies (TED: Ideas Worth Spreading)
Articles about Galaxies (Big Think)

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Innovation

Science

Galactic Astronomy is the study of the Milky Way galaxy and all its contents.The Milky Way galaxy, where the Solar System is located, is in many ways the best-studied galaxy, although important parts of it are obscured from view in visible wavelengths by regions of cosmic dust. The development of radio astronomy, infrared astronomy and submillimetre astronomy in the 20th century allowed the gas and dust of the Milky Way to be mapped for the first time. — Wikipedia

Extragalactic Astronomy is the branch of astronomy concerned with objects outside the Milky Way galaxy. In other words, it is the study of all astronomical objects which are not covered by galactic astronomy. The closest objects in extragalactic astronomy include the galaxies of the Local Group, which are close enough to allow very detailed analyses of their contents (e.g. supernova remnants, stellar associations). — Wikipedia

Astronomic (YouTube Channel)
Astronomic (Facebook)

Galaxies (NASA Science)
What are Galaxies? (NASA Science)
Galaxies (Imagine the Universe, NASA Goddard Space Flight Center)

Galaxy Videos (ViewSpace, Space Telescope Science Institute)
Galaxy Evolution Videos (ViewSpace, Space Telescope Science Institute)
Galaxy Structure Videos (ViewSpace, Space Telescope Science Institute)

Galaxies (Lunar & Planetary Institute)
Galaxies and Cosmology (Max Planck Institute for Astronomy)

Galaxies (Eric Weisstein’s World of Astronomy, Wolfram Research)
Galactic Astronomy (Eric Weisstein’s World of Astronomy, Wolfram Research)

Galaxies (Wolfram Alpha)

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Preservation

History

Historical Overview of the Discovery of Galaxies (Earth Guide)
Historical Overview of the Discovery of Galaxies (Introduction to Astronomy, Wolfgang H. Berger, UC San Diego)
Timeline of Knowledge about Galaxies, Clusters of Galaxies … (Wikipedia)

Library

DDC: 523.112 Galaxies (Library Thing)
Subject: Galaxies (Library Thing)

Subject: Galaxies (Open Library)

LCC: QB 856 Galaxies (Library of Congress)

Subject: Galaxies (WorldCat)

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Participation

Education

Science Education Videos (NASA Goddard Space Flight Center, YouTube Playlist)
NASA Goddard Space Flight Center (Official Website)

What is a Galaxy? (Space Place, NASA)
Galaxies (Imagine the Universe, NASA Goddard Space Flight Center)

Galaxies (Science Trek)
Galaxies (Cosmos4Kids)
Galaxies (Space Scoop)

Galaxies (Astronomy Center, ComPADRE)

Galaxies, Part 1 (Crash Course Astronomy, YouTube Video)
Galaxies, Part 2 (Crash Course Astronomy, YouTube Video)

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

Community

Organization

International Astronomical Union Division J – Galaxies and Cosmology

News

Galaxies (Nova Research Highlights, American Astronomical Society)

Galaxies (EurekaAlert, AAAS)
Galaxies (JSTOR)

Galaxies (Sky & Telescope, AAS)
Galaxies (Astronomy Magazine)

Galaxies (Science Daily)
Galaxies (Phys.org)

Recent News from Phys.org …

NASA's Chandra releases timelapse movies of Crab...
on April 24, 2024 at 8:51 pm
New movies of two of the most famous objects in the sky—the Crab Nebula and Cassiopeia A—are being released from NASA's Chandra X-ray Observatory. Each includes X-ray data collected by Chandra over about two decades. They show dramatic changes in the debris and radiation remaining after the explosion of two massive stars in our galaxy.
International team detects eruption of...
on April 24, 2024 at 3:00 pm
While ESA's satellite INTEGRAL was observing the sky, it spotted a burst of gamma-rays—high-energy photons—coming from the nearby galaxy M82. Only a few hours later, ESA's XMM-Newton X-ray space telescope searched for an afterglow from the explosion but found none.
Black hole 'traffic jams' discovered in galactic...
on April 24, 2024 at 2:31 pm
An international study, led by researchers from Monash University, has revealed crucial insights into black hole dynamics within massive disks at the centers of galaxies.
Star bars show universe's early galaxies evolved...
on April 23, 2024 at 11:10 pm
The universe's early galaxies were less chaotic and developed much faster than previously thought, according to new research looking back more than ten billion years in time. An international team of astronomers led by Durham University, UK, has used the James Webb Space Telescope (JWST) to find evidence of bar formation when the universe was only a few billion years old.
Hubble celebrates 34th anniversary with a look at...
on April 23, 2024 at 8:07 pm
In celebration of the 34th anniversary of the launch of NASA's legendary Hubble Space Telescope on April 24, astronomers took a snapshot of the Little Dumbbell Nebula (also known as Messier 76, M76, or NGC 650/651) located 3,400 light-years away in the northern circumpolar constellation Perseus. The photogenic nebula is a favorite target of amateur astronomers.