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Jeanna,Bryner.livescience.2017.karen Rowan. All rights Reserved.May 5, 2017. http://www.livescience.com/32828-humans-really-made-stars.html
Dr. Johnson.Windows to the universe.January 28, 2008.NA.NASA.April 27,2017. https://www.windows2universe.org/sun/effect_on_earth.html
Tom,Hinrichs.What Stars Are Made of?.2009.Johnson.Northwestern University.April 27, 2017. http://www.qrg.northwestern.edu/projects/vss/docs/space-environment/2-what-are-stars-made-of.html
Jeanna,Bryner.Livescience.2017.Karen Rowan.All Rights Reserved.May 5, 2017. http://www.livescience.com/32828-humans-really-made-stars.html
Jeanna,Bryner.livescience.2017.karen Rowan. All rights Reserved.May 5, 2017. http://www.livescience.com/32828-humans-really-made-stars.html