Sentence:  The results of present observations of the thermal radio emission of the moon are consistent with the very low thermal conductivity of the surface layer which was derived from the variation in the <WSD>infrared</WSD> emission during eclipses ( e.g. , Garstung , 1958 ) . 
Meaning of the word marked with <WSD> tags:  electromagnetic radiation with wavelengths longer than visible light but shorter than radio waves