protogalaxy

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protogalaxy

(proh-toh-gal -ăks-ee) An inhomogeneous gas cloud in the early stages of evolution into a galaxy. See galaxies, formation and evolution.

protogalaxy

[‚prōd·ō′gal·ik·sē]
(astronomy)
A clump of matter in an early stage of galaxy formation in which the matter has started to collapse under its own gravity to form a galaxy.
References in periodicals archive ?
Depending upon the size of the dark-matter density enhancement acting as the seed, anything from a small protogalactic fragment to a full-fledged galaxy could develop.
A few million years later they blow up as supernovae, sending yet more matter outward at supersonic speeds into the still-collapsing protogalactic cloud.
Some gas is always left over, and in a collapsing protogalactic cloud this gas might have settled to the center without forming stars.