Water vapor interferes with radio astronomy at higher frequencies in order to minimize the water vapor content in the line of sight .
Higher frequencies has led to building radio observatories that conduct observations at millimeter wavelengths at very high and dry sites .
Water vapor interferes with radio astronomy at higher frequencies , which has led to building radio observatories that conduct observations at millimeter wavelengths at very high and dry sites , in order to minimize the water vapor content in the line of sight .