First Sentence:
Hydrogen is a very special element.
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Key Phrases - Statistically Improbable Phrases (SIPs):
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cosmic chemical memory, million silicon atoms, nucleosynthesis origin, isotopic decomposition, very underabundant, abundant nuclear species, ofthe periodic table, presolar grains, presolar supernova grains, concentration leaps, average eject, cosmogenic radioactivity, most abundant nucleus, supernova structure, travels through the interstellar gas, explosive silicon burning, extinct radioactivity, measured isotopic abundances, galactic total, solar isotopic ratio, mainstream grains, radioactive progenitor, alpha nuclei, explosive helium burning, hydrogen plus helium
Key Phrases - Capitalized Phrases (CAPs):
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Big Bang, Milky Way, Compton Gamma Ray Observatory, Hans Bethe, Fred Hoyle, Chandra X-Ray Observatory, Advanced Composition Explorer, Gran Sasso, Hubble Space Telescope, Main Sequence, Roman Empire, Sir Humphrey Davy, Abundance Argon, Abundance Neon
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