Types Of Galaxies
By Alessandro R.
What is a Galaxy?
3 Main types of Galaxies
Elliptical Galaxies
Spiral Galaxies
Irregular Galaxies
Irregular galaxies have no true structure and are mainly just clusters of stars. They are only divided into 2 groups Irr I and Irr II. Irr II stars mainly contain humongous quantities of dust which blocks a lot of the light from the stars. Irr I are composed of elemental hydrogen gas and young hot stars.
Works Cited
Gordon, K. SPACE PHOTOS THIS WEEK: Spiral Galaxies, Wildfire, More. Digital image. Http://news.nationalgeographic.com/news/2009/02/photogalleries/week-in-space-pictures-29/images/primary/090210-01-spiral-galaxy-hubble_big.jpg. 10 Feb. 2009. Web.
NASA. Irregular Galaxy. Digital image. Http://phillips.seti.org/kids/galaxies.html. Web.
"Ask an Astronomer." Cool Cosmos. Caltech, n.d. Web. 02 June 2015.
Milky Way Galaxy. Digital image. Http://upload.wikimedia.org/wikipedia/commons/thumb/4/43/ESO-VLT-Laser-phot-33a-07.jpg/300px-ESO-VLT-Laser-phot-33a-07.jpg. Web.
Elliptical Galaxy. Digital image. Http://frigg.physastro.mnsu.edu/~eskridge/astr101/m87outer.gif. Web.
"Types and Classification of Galaxies." CLASSIFICATION. Cornell, 18 Apr. 2000. Web. 2 June 2015 <http://www.astro.cornell.edu/academics/courses/astro201/galaxies/types.htm>