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en.wikipedia.org/wiki/Elliptical_galaxy

An elliptical galaxy is a type of galaxy having an approximately ellipsoidal shape and a smooth, nearly featureless brightness profile. Unlike flat spiral galaxies with organization and structure, they are more ... Stars found inside of elliptical galaxies are on average much older than stars found in spiral galaxies. Most elliptical ...

phys.libretexts.org/TextMaps/Astronomy_and_Cosmology_Textmaps/Map%3A_Astronomy_(OpenStax)/27%3A_Active_Galaxies%2C_Quasars%2C_and_Supermassive_Black_Holes/27.3%3A_Quasars_as_Probes_of_Evolution_in_the_Universe

Jan 10, 2017 ... Back then, most gas had not yet collapsed to form stars, so there was ... Astronomers have found that collisions were also much more common early in the ... in a galaxy's life than later on, when much of it has been converted into stars. ... Collisions in today's universe are less frequent, but they do happen.

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 ...

curious.astro.cornell.edu/about-us/96-the-universe/galaxies/formation-and-evolution/530-what-happens-when-galaxies-collide-beginner

Jun 27, 2015 ... It is very common for galaxies to collide and interact with other ... had interactions with other galaxies since the time they formed. ... When we catch two galaxies in the process of merging, we can only get a snapshot of one ... galaxies at different points in the history of their merging, and then ... Most Recent.

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.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 ... When two spirals collide, they lose their familiar shape, morphing ...

www.cfa.harvard.edu/~ejchaisson/cosmic_evolution/docs/text/text_gal_7.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 ...

courses.lumenlearning.com/astronomy/chapter/the-formation-and-evolution-of-galaxies-and-structure-in-the-universe

As we will see, the short answer to how the universe got this way is “dark matter ... There have been two main types of galaxy formation models to explain all those ... 6 billion years old and that they are much more common today than they were .... gas, and dark matter through collisions, and the stars acquired through these ...

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.

skyserver.sdss.org/dr1/en/astro/galaxies/galaxies.asp

The Milky Way has more than a hundred billion stars, but the stars are so far apart ... When galaxies collide they interpenetrate - the stars slip through - but gas ... have represented an evolutionary sequence for galaxies, but today we know ... Stars in ellipticals do not spread out into a thin disk, as they do in spiral galaxies; ...