Interstellar extinction is caused by dust grains distributed in the molecular clouds that absorb and scatter the starlight at other wavelengths. It is a tremendous obstacle to observing objects either towards Galactic plane or molecular clouds. If you are not an astronomer and have interest in learning more about interstellar extinction, some introductory material is given below:

Trumpler, R. J. (1930):. "Preliminary results on the distances, dimensions and space distribution of open star clusters". Lick Observatory Bulletin 14 (420): 154–188.

Savage & Mathis, 1979, ARAA , 17, 73

Mathis, 1990, ARAA, 28, 37

Amôres, E. B., 2000, Master Dissertation, Models for interstellar extinction in the Galaxy, Universidade de São Paulo. (In Portuguese only).

Whittet, Doug C. B. (2003). Dust in the Galactic Environment. Series in Astronomy and Astrophysics (2nd ed.). CRC Press. p. 10. ISBN 0750306246.

Robin, A.C., A&A, 500, 165-166

Robin, A., C., et al., Memorie della Societa Astronomica Italiana, v.86, p.579 (2015)

Sale, S. E., Memorie della Societa Astronomica Italiana, v.86, p.568 (2015)

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