Captions provided by CCTubes – Captioning the Internet! Do you ever look up into the night sky and wonder how many stars there are?
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Sources:
http://curious.astro.cornell.edu/people-and-astronomy/the-history-of-astronomy
https://asd.gsfc.nasa.gov/blueshift/index.php/2015/07/22/how-many-stars-in-the-milky-way/
https://www.nasa.gov/feature/goddard/2016/hubble-reveals-observable-universe-contains-10-times-more-galaxies-than-previously-thought
https://www.space.com/25303-how-many-galaxies-are-in-the-universe.html
https://www.universetoday.com/102630/how-many-stars-are-there-in-the-universe/
http://www.esa.int/Our_Activities/Space_Science/Herschel/How_many_stars_are_there_in_the_Universe
https://www.nasa.gov/content/goddard/nasa-satellites-catch-growth-spurt-from-newborn-protostar
https://www.universetoday.com/24299/types-of-stars/
https://science.nasa.gov/astrophysics/focus-areas/how-do-stars-form-and-evolve
http://www.atnf.csiro.au/outreach/education/senior/cosmicengine/stars_types.html
https://lco.global/spacebook/protostar/
http://www.skyandtelescope.com/astronomy-resources/the-spectral-types-of-stars/
http://www.star.ucl.ac.uk/~pac/obafgkmrns.html
http://hyperphysics.phy-astr.gsu.edu/hbase/Starlog/staspe.html
http://astro.unl.edu/naap/ebs/spectraltype.html
https://people.highline.edu/iglozman/classes/astronotes/hr_diagram.htm
http://astronomy.swin.edu.au/cosmos/H/Hertzsprung-Russell+Diagram
http://chandra.harvard.edu/edu/formal/stellar_ev/story/index3.html
https://www.universetoday.com/12648/will-earth-survive-when-the-sun-becomes-a-red-giant/
http://www.telescope.org/pparc/res8.html
http://astronomy.swin.edu.au/cosmos/N/Neutron+Star
https://www.space.com/22437-main-sequence-stars.html
