http://en.wikipedia.org/wiki/SpectroscopyOriginally Posted by BillGeek
What REALLY gets me wondering is: How do they know that Pluto's surface is made of 98% Nitrogen, Methane, etc... if they've never even landed a probe there?
Pretty clever huh.Spectrometry is the spectroscopic technique used to assess the concentration or amount of a given species. In those cases, the instrument that performs such measurements is a spectrometer or spectrograph.
Spectroscopy/spectrometry is often used in physical and analytical chemistry for the identification of substances through the spectrum emitted from or absorbed by them.
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