We Don’t Know What the Sun Is Made Of

Unlike Earth, our Sun is a giant ball of mostly hydrogen and helium. Astronomers managed to figure that one out roughly 100 years ago. But after all this time, they still can't come to an agreement on what "mostly" means, precisely.

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Images

https://www.gettyimages.com
https://commons.wikimedia.org/wiki/File:The_Blue_Marble_(5052124705).jpg
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https://commons.wikimedia.org/wiki/File:Periodic_Table_Armtuk3.svg