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Dust Clouds at the Center of Milky Way Stanislav Kováč • In our Milky Way and in external galaxies, the space between the stars is filled with an interstellar medium consisting of gas and dust • Extinction is a term used in astronomy to describe the absorption and scattering of light emitted by astronomical objects by matter (dust and gas) between the emitting object and the observer. • interstellar extinction varies with wavelength such that the shorter the wavelength the stronger the extinction • reddening • To measure the extinction curve for a star, the star's spectrum is compared to the observed spectrum of a similar star known not to be affected by extinction (unreddened) • Extinction in the direction of the centre of Galaxy is about 25 magnitudes. The End