Task: Text Categorization
Input (English): One type of this phenomenon was measured using a Fe-57 detector in the Harvard Tower experiment. This effect produces the first-degree anisotropy in the CMBR. Recombination of hydrogen atoms occurred at a value of approximately 1100 for the quantity associated with this effect, whose cosmological variety increases with age and distance; that is because the universe is (*) expanding according to Hubble's law. A few objects, such as Andromeda, exhibit the opposite of this effect, because they are moving towards us. For 10 points, name this phenomenon, in which the wavelength of astronomical objects receding from Earth broadens, producing a namesake change in color.
Output (English): Science