Re:How did they measure it ? (Score 2, Informative)

A spectrometer can easily measure the temperature of an object. the laws governing black body radiation (http://en.wikipedia.org/wiki/Black_body_radiation ) are dependent only on temperature. If you can sort out the radiation peaks you see representing quantum energy level transitions, which is easy, since they look like peaks and black body is a curve, you can find the temperature of a radiating body.