Neil deGrasse Tyson

“As the cosmos continues to cool—dropping below a hundred million degrees—protons fuse with protons as well as with neutrons, forming atomic nuclei and hatching a universe in which ninety percent of these nuclei are hydrogen and ten percent are helium, along with trace amounts of deuterium (“heavy” hydrogen), tritium (even heavier hydrogen), and lithium.”

Neil deGrasse Tyson, Astrophysics for People in a Hurry
tags: astro
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Astrophysics for People in a Hurry Astrophysics for People in a Hurry by Neil deGrasse Tyson
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