Galaxy

Galaxies

A galaxy is a gravity-bound physical system containing stars, planetary systems, stellar remnants, substellar objects, interstellar gas, dust and dark matter. Galaxies range from dwarfs with fewer than a thousand stars to supergiants with one hundred trillion stars. They are classified by visual form, including elliptical, spiral and irregular types. Most galaxies belong to groups, clusters and superclusters, and may occasionally collide during their lifetimes.

Main components: Stars, gas, dust and dark matter bound by gravity
Visual categories: Elliptical, spiral or irregular
Organisation: Groups, clusters and superclusters

Sources and credits

Article: Galaxy (English Wikipedia)
Wikidata: Q318
Text: Card text is adapted from the English Wikipedia article by an automated summary. Wikipedia content is available under CC BY-SA 4.0; see the article history for its contributors. CC BY-SA 4.0 · Article history and contributors
Illustration: By The Hubble Heritage Team (AURA/STScI/NASA)NASA Headquarters - Greatest Images of NASA (NASA-HQ-GRIN). Public domain · File page on Wikimedia Commons
The Hubble Heritage Team (AURA/STScI/NASA)NASA Headquarters - Greatest Images of NASA (NASA-HQ-GRIN), http://nix.larc.nasa.gov/info;jsessionid=1sl2so6lc9mab?id=GPN-2000-000933&orgid=12http://imgsrc.hubblesite.org/hu/db/images/hs-1999-25-a-full_tif.tif
Modifications: Resized and converted to WebP
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