“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.”
Quote by Neil deGrasse Tyson
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Astrophysics for People in a Hurry
This book provides a succinct and accessible introduction to the fundamental principles of astrophysics, covering topics such as the structure of the universe, black holes, and the nature of dark matter. more
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