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en.wikipedia.org/wiki/Galaxy_formation_and_evolution

The study of galaxy formation and evolution is concerned with the processes that formed a ... Astronomers now believe that disk galaxies likely formed first, then evolved into ... More recent theories include the clustering of dark matter halos in the ... It has also been suggested that the dark matter halo can pull the galaxy, thus ...

www.astronomynotes.com/galaxy/s10.htm

May 1, 2013 ... Models for galaxy formation have been of two basic types: ... origin of the galaxies says that they formed from huge gas clouds larger than the ... If the gas cloud was rotating faster, then the collapsing gas cloud formed a disk before most of the stars were made. ... There should still be galaxies forming today.

www.cfa.harvard.edu/~ejchaisson/cosmic_evolution/docs/fr_1/fr_1_gal7.html

On the other hand, given that the elliptical galaxies are so clearly old, then perhaps the ... As already noted, given the size, scale, and groupings of galaxies, collisions and .... all galaxies has been strengthened recently as astronomers have become ... more common in the past than they are today, galaxies do seem to have ...

www.sciencemag.org/news/2010/03/galaxy-collisions-give-birth-quasars

Mar 25, 2010 ... Get more great content like this delivered right to you! ... Then they trained the Chandra and Spitzer space telescopes, which can see in x-ray ...

astronomy.nmsu.edu/tharriso/ast110/class24.html

Today we will take a closer look at ideas for why there are different types of galaxies. ... If you have been watching the news coverage of the revolutions in the Middle ... Giant ellipticals are about 10X more massive than the largest spiral galaxies. .... Galaxy collisions are quite common, here are two spirals ( knicknamed the ...

phys.org/news/2016-10-galaxies-collide.html

Oct 3, 2016 ... If one of the colliding galaxies is much larger than the other, it will remain largely ... is believed to have collided with at least one other galaxy in the past. ... This indicated that unlike most galaxies that have been observed ... Today, it is understood that galactic collisions are a common feature in our universe.

www.space.com/22395-elliptical-galaxies.html

Aug 15, 2013 ... Astronomers have identified more spiral galaxies than ellipticals, but that is ... If fewer elliptical galaxies have been spotted, why do astronomers think they ... The universe is a violent place, and collisions between galaxies are ...

www.studyblue.com/notes/note/n/chapter-21/deck/14698533

Why would this tend to change the spiral galaxy into an elliptical galaxy? ... Why should galaxy collision have been more common in the past than they are today  ...

courses.lumenlearning.com/astronomy/chapter/galaxy-mergers-and-active-galactic-nuclei

Let's examine in more detail what happens when two galaxies collide. ... The stars themselves in this pair of galaxies will not be affected much by this cataclysmic event. ... the Milky Way that has been disrupted by the passage of a smaller galaxy. .... starlight, and they have higher rates of star formation than isolated galaxies.