Galaxy

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Star survey produces stunningly detailed image of Milky Way (Thomas H. Maugh II, LA Times)
Zoomable Image (European Southern Observatory)

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

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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

David Darling’s Internet Encyclopedia of Science, Britannica

Introduction

Galaxy Introduction (Astronomy Online)

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

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Stars & Galaxies (NASA JPL)

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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.

  • Pairs of small colliding galaxies may seed future...
    on August 9, 2018 at 6:45 pm

    In a new study, astronomers show how gas expelled in the merger of two small galaxies can linger across vast distances for billions of years, where it may eventually feed gas to more massive galaxies to make new stars. […]

  • Elliptical elegance in glittering host of galaxies
    on August 8, 2018 at 11:54 am

    A glittering host of galaxies populate this rich image taken with ESO's VLT Survey Telescope, a state-of-the-art 2.6-m telescope designed for surveying the sky in visible light. The features of the multitude of galaxies strewn across the image allow astronomers to uncover the most delicate details of galactic structure. […]

  • Einstein's general relativity confirmed near...
    on July 30, 2018 at 1:01 pm

    Observations made with ESO's Very Large Telescope have for the first time clearly revealed the effects of Einstein's general relativity on the motion of a star passing through the extreme gravitational field very close to the supermassive black hole in the center of the Milky Way. This long-sought result represents the climax of a 26-year-long observation campaign using ESO's telescopes in Chile. […]

  • X-ray technology reveals never-before-seen matter...
    on July 28, 2018 at 12:41 pm

    Scientists have clarified how gravity affects the shape of matter near the black hole in binary system Cygnus X-1. Their findings may help scientists further understand the physics of strong gravity and the evolution of black holes and galaxies. […]

  • Thin gap on stellar family portrait
    on July 26, 2018 at 8:10 pm

    A thin gap has been discovered on the Hertzsprung-Russell Diagram (HRD), the most fundamental of all maps in stellar astronomy, a finding that provides new information about the interior structures of low mass stars in the Milky Way Galaxy, according to a new study. […]