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alpha alpha particles American amino acids animals antiproton astronomer atmosphere bacteria biochemist blood body brain called carbon atoms carbon dioxide cells cent century chain chemical chemist chemistry chromosomes compound containing detected developed discovered discovery disease distance earth electric electrons elements energy enzyme fission galaxies gases gene German glucose gravitational heat helium hemoglobin hormone human hydrogen hydrogen atoms instance isotope light light-years liquid living magnetic field mass measure metal miles per second million molecule moon motion named nature nerve neutrinos neutron nitrogen Nobel Prize nuclear nucleic acid nucleus ocean orbit ordinary organic oxygen particles physicist plant possible produced protein proton quantity quasars radiation radio radioactive reaction received the Nobel rotation scientists seemed showed solar space speed stars structure substances surface temperature theory thorium tion tissue turned universe uranium velocity virus viruses vitamin wavelength waves white dwarfs X-rays