newevolutiondesigns.com
very-amazing.blogspot.com
https://www.youtube.com/watch?v=zDQzKTedGNE
www.pixsharx.com
http://www.astro.cornell.edu/academics/courses/astro201/galaxies/types.htm
http://www.space.com/13320-big-bang-universe-10-steps-explainer.html
https://www.cfa.harvard.edu/COMPLETE/learn/star_and_planet_formation.html
http://hubblesite.org/hubble_discoveries/discovering_planets_beyond/how-do-planets-form
www.uni.edu
http://stardate.org/astro-guide/btss/galaxies/galaxy_formation
http://science.howstuffworks.com/dictionary/astronomy-terms/galaxy6.htm