Curious About Astronomy: How are galaxies formed?

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** How are galaxies formed? **

/I am sixth grader and I am doing a science project on galaxies. I wanted
to know how galaxies are formed./

As you may know, galaxies are mainly of two kinds: spiral galaxies and
elliptical galaxies (there are also irregular galaxies).

Spiral galaxies form from the collapse of a protogalactic cloud. Spiral
galaxies consist of three components: a rotating disk, a bulge and a halo.
When the protogalactic cloud collapses, the stars in the bulge and halo
form first. These stars have rather random orbits around the galactic
center. The remainder of the cloud forms a disk due to the conservation of
angular momentum (the same effect as the spinning up of the dancer when


Source: curious.astro.cornell.edu/question.php?number=157


how are galaxies formed


Galaxy formation and evolution - Wikipedia, the free encyclopedia

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** Galaxy formation and evolution **

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Part of a series on
Physical cosmology
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· Redshift
· Hubble's law
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· Friedmann equations
· FLRW metric

Structure formation

· Shape of the universe
· Structure formation
· Reionization
· *Galaxy formation*
· Large quasar group
· Large-scale structure
· Galaxy filament

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The study of *galaxy formation and evolution* is concerned with the
processes that formed a heterogeneous universe from a homogeneous
beginning, the formation of the first galaxies, the way galaxies change
over time, and the processes that have generated the variety of structures
observed in nearby galaxies. It is


Source: en.wikipedia.org/wiki/Galaxy_formation_and_evolution

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