The black‐body universe—spectrum extended
DOI: 10.1063/1.3048475
Studies of the absorption spectrum of interstellar CN molecules and of radio waves at 20.7‐cm wavelength seem to add more evidence that the universe is full of 3°K black‐body radiation left over from a primeval fireball. The first two points that fit the 3° spectrum were measured directly from radio emanations by Arno A. Penzias and Robert W. Wilson, who looked at 7.5‐cm wavelength, and P. G. Roll and D. T. Wilkinson, who recorded at 3.2 cm (see