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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 ... There is a common misconception that Hubble believed incorrectly that the ... Models using this sort of process predict more small galaxies than large ... It has also been suggested that the dark matter halo can pull the galaxy, thus ...

www.studyblue.com/notes/note/n/chapter-21/deck/6297115

Why should galaxy collisions have been more common in the past than they are today? -compared to their size galaxies are much closer together than stars 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  ...

www.ifa.hawaii.edu/users/shadia/lectures/habbal_astro110-01_spring2009_lecture34.pdf

This means we see distant galaxies as they were when they were much younger. ... Spiral galaxies have more gas, more young stars ... More often in the past, since the universe was smaller. • Why do ... Protogalactic clouds then collapse to form disk galaxies. ... Later interactions or collisions of galaxies can also affect their ...

www.astro.cornell.edu/academics/courses/astro201/galaxies/evol.htm

Apr 18, 2000 ... Here we will talk about the formation and evolution of two of the three main ... Galaxies are thought to have begun from large irregular clouds of ... Certain sections of the clouds were probably slightly more dense than others. ... Since they were closer together, especially in galaxy clusters, collisions were ...

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 ... As already noted, given the size, scale, and groupings of galaxies, collisions and .... to normal galaxies, implying a continuous range of cosmic energy, has been ... 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 ...

www.coursehero.com/file/7932528/Exam-3-Review

Why should galaxy collisions have been more common in the past than they are today? 6. What is a starburst galaxy? How do observations of starbursts help us ...

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

The hydrogen image shows that the two galaxies are wrapped in a common ... You might therefore have been surprised to hear about collisions between galaxies. ... Slow collisions and mergers can even transform two or more spiral galaxies into ... and peculiar shapes, they are usually clumpier than normal galaxies today, ...