Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. A mass of hydrogen that is sufficient to form or is already beginning to form a galaxy.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. A cloud of gas which is starting to form a galaxy.

Etymologies

proto- +‎ galaxy (Wiktionary)

Examples

  • But in the October 2 issue of Nature, the astronomers report that the magnetic field they measured in this distant "protogalaxy" is at least 10 times greater than the average value in the Milky Way.

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  • Because this formation is happening on a large physical scale since galaxies are on the scale of tens or hundreds of thousands of light-years across, some parts of the protogalaxy will be more dense than others, which means the shock waves will be unevenly distributed.

    Wired Top Stories

  • The relatively rapid gravitational collapse sends shock waves through the gas, blowing some of it away from the protogalaxy, but driving star formation in the process.

    Wired Top Stories

  • The latest simulations of these events have found that when small supermassive black holes merge the resulting black hole receives an average kick of about 200 kilometers per second, which is fast enough to sling it out of a protogalaxy.

    PhysOrg.com - latest science and technology news stories

  • The world's biggest steerable radio telescope in Green Bank (West Virginia) directly measured the field of protogalaxy DLA-3C286.

    A Babe in the Universe

  • Detected in a distant protogalaxy, it measures at least 10 times greater than the

    SPACE.com

  • The young protogalaxy they probed, DLA-3C286, is located in a region of the northern sky that is directly overhead during the spring in the northern hemisphere.

    SPACE.com

  • I’m part of that protogalaxy five billion light years away and of that cigarette butt in Cleveland.

    Last Words

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