ASTRONOMY
http://www.universetoday.com/13860/guide-to-space/
http://www.telegraph.co.uk/science/2016/03/15/12-facts-about-pluto-everyone-should-know/
http://time.com/3957053/pluto-facts/
http://www.space.com/43-pluto-the-ninth-planet-that-was-a-dwarf.html
http://www.planetsforkids.org/planet-pluto.html
http://www.space.com/19824-clyde-tombaugh.html
http://www.space.com/43-pluto-the-ninth-planet-that-was-a-dwarf.html
http://space-facts.com/pluto/