You can't, temperature is the average kenetic energy of the molecules and in space, there simply are too few or none to measure.
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The temperature of an object is a measure of the thermodynamic energy of the object.
The amount of space occupied by an object is called its VOLUME.
Three points can determine a plane but not 3-d space.
The space within an object is its volume.
Judge by the distance it has moved in relation to another object.