31.   The spectrometer, not much larger than a portable television, will hang from the bottom of the Observer and record the infrared radiation emitted from the surface.

32.   Infrared radiation cannot be seen by the eye, but it is the most common type of light from distant galaxies.

33.   It allowed them to examine the infrared radiation reflected by the dust disk without interference from the star.

34.   Kim and his colleagues used an infrared tympanic thermometer, which determines core body temperature by measuring the infrared radiation given off by the ear drum.

35.   The instrument can detect infrared radiation, which is to say that it can pick up on unusual heat.

36.   They are transparent to incoming sunlight but absorb infrared radiation Earth emits back toward space.