21. A small mirror in the center of the secondary mirror prevents the instrument from seeing its own thermal emission . 22. Observations of thermal emissions by the Spitzer Space Telescope in 2007 give a diameter of and an albedo of. 23. Spirit also was measuring the temperature and makeup of the rocks and soil around it with its thermal emission spectrometer. 24. The instrument, known as a miniature thermal emission spectrometer, can help determine the makeup of rocks and soil. 25. The mini-thermal emission spectrometer data are superimposed on an image taken by the rover's panoramic camera. 26. The size of the large Kuiper belt objects can be determined by simultaneous observations of thermal emission and reflected sunlight. 27. Launched in 2001, although it carried multiple instruments only Thermal Emission Imaging System was designed to look at minerals. 28. Watt said of Christensen, who is also the Mars rover's principle investigator of the mini thermal emissions spectrometer. 29. There is more thermal emission than reflection at some near-infrared wavelengths for massive and / or young gas giants. 30. This is a property of a surface that describes how its thermal emissions deviate from the ideal of a black body.
