Astronomers probe creation by measuring isotopes.
Glanz
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D055580:Astronomical Phenomena; D001256:Astronomy; D003903:Deuterium / Q000737:chemistry*; D006371:Helium / Q000737:chemistry; D006859:Hydrogen / Q000737:chemistry; D007554:Isotopes; D008094:Lithium / Q000737:chemistry
D007554:Isotopes; D006371:Helium; D006859:Hydrogen; D008094:Lithium; D003903:Deuterium