Kirchhoff's second law
A low-density gas will radiate an emission-line spectrum with an underlying emission continuum.
Kirchhoff's third law
Continuous radiation viewed through a low-density gas will produce an absorption-line spectrum.
The blue color is mostly from the light emitted by carbon monoxide ions but other types of ions also contribute to the light. Since the gas is so diffuse, the observed spectrum is an emission-line spectrum.
 See also: Planet, Astronomy, Spectrum, Density, Second
  
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