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Additional resources for [Magazine] Scientific American. Vol. 275. No 6
As a result, the absorp- mately, just lack of time had prevented tion spectrum of deuterium is similar to the accumulation of enough light for a that of single-nucleon hydrogen, but all convincing result. The technique is now the lines show a shift toward the blue practical only because of improved, more end of the spectrum equivalent to that efficient detectors, the 10-meter Keck arising from a motion of 82 kilometers telescope in Hawaii and advanced highper second toward the observer. In resolution, high-throughput spectrospectrographic measurements of a hy- graphs such as the Keck HIRES.
The big bang produced a universe made almost entirely of hydrogen and helium. Deuterium, the heavy isotope of hydrogen, was made only at the beginning of the universe; thus, it serves as a particularly important marker. The ratio of deuterium to ordinary hydrogen atoms depends strongly on both the uniformity of matter and the total amount of matter formed in the big bang. During the past few years, astronomers have for the first time begun to make reliable, direct measurements of deuterium in ancient gas clouds.
Analysis of the characteristic line patterns for hydrogen gas can reveal the presence of the heavy isotope of the element deuterium. Primordial Deuterium and the Big Bang ROGER RESSMEYER Corbis Copyright 1996 Scientific American, Inc. COURTESY OF CRAIG J. HOGAN (inset); ALFRED T. KAMAJIAN (painting) helium, such as lithium. ) The exact percentages of helium, deuterium and lithium depend on only one parameter: the ratio of protons and neutrons—particles jointly categorized as baryons—to photons.