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The Stuff of Stars

3 Dec 2018, 18:47 UTC
The Stuff of Stars NASA/GSFC/SDO

“The universe is mostly hydrogen and ignorance,” goes a version of one of my favorite quotes. It’s true: we’re pretty ignorant about dark energy (~70% of the universe) and dark matter (~26% of the universe). Of the matter that we do know about (the “baryonic matter”), about 3/4 is hydrogen!

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