All objects emit and absorb thermal radiation. We don't always notice this because. But if we think about it we know this is true.
If we take ice cream out of the freezer it will absorb heat from the air in the room until it becomes the same heat as the air in the room.
Also if we put a mug of hot chocolate on the table beside our bed it will loose (emit) heat until it is the same temperature as the air in the room.
The hotter the object,the more energy it radiates.
The amount of thermal energy emited or absorbed depends on its surface,shape and dimensions.
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