Half Of All Universe's Stars Are Not Part Of A Galaxy

A rough estimate suggests there are about 10 trillion galaxies in the universe. Data suggests half of them are rogue stars, or stars roaming on their own outside galaxies.

Sources:
http://www.sciencemag.org/lookup/doi/10.1126/science.1258168
https://www.space.com/26078-how-many-stars-are-there.html

WATCH MORE: Black Hole Ejects Star Our Of Our Galaxy
https://www.youtube.com/watch?v=CoHievevdbc

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Produced, directed, and edited by:
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NASA/Goddard Space Flight Center
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JPL-Caltech
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NCSA
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