All hot objects emit (__________ out) electromagnetic radiation. For most objects, at common temperatures, the radiation is limited to the __________ part of the spectrum. As the object is heated the frequency of the radiation __________ to the point at which it becomes visible to the human __________. At this point the object is said to be red hot. If it is heated further then it emits green light mixing with the red light to form orange. Still further and then __________ light is emitted, mixing to produce __________ light. The hottest stars in the sky in fact glow __________ hot.
As with all electromagnetic waves, the __________ radiation does not require a medium to travel through and so can cross a vacuum, just as the heat from the __________ reaches us through space. When standing in the sunshine you feel the sun's heat more if you are wearing __________. This is because dark, matt surfaces absorb more radiation than __________, __________ ones - these tend to reflect it instead.
For objects at the same temperature, __________, __________ objects will emit more radiation than __________, __________ ones. We say that black objects are both good emitters and absorbers of radiation.