Spectroscopy

The document discusses spectroscopy techniques used in astronomy to analyze the composition of stars and other astronomical objects. Spectrometers are used to measure the chemical composition and properties of objects by analyzing their spectral lines. Spectroscopy can be classified as atomic or molecular and uses absorption, emission, or scattering of light at specific wavelengths to identify elements and gases present. Continuous spectra represent dense gases or liquids while emission line spectra indicate a low density hot gas and absorption line spectra show dark lines where a cool gas absorbs wavelengths from a continuous spectrum.