**Preface to "Advances in the Physics of Stars - in Memory of Prof. Yuri N. Gnedin"**

This reprint collects articles devoted to different aspects of the physics of stars, their types, properties, stages of evolution, interstellar medium, dark matter and dark energy. It is devoted to the memory of outstanding scientist Prof. Dr. Yuri N. Gnedin, who not only organized the Department of Astrophysics at Pulkovo Astronomical Observatory of the Russian Academy of Sciences and led it for several decades but also initiated a number of prospective research projects in several other astrophysical Institutions. The scope of scientific interests and expertise of Prof. Gnedin were extraordinarily wide. He performed pioneering work in the theoretical description of polarized radiation transfer; generation of high-energy radiation in close binary star systems and galactic nuclei; cyclotron lines in the spectra of accreting neutron stars; determination of magnetic fields of cosmic sources from polarimetric observations; and the physics of intermediate-mass and supermassive black holes, magnetic white dwarfs, supernovae, exoplanets and dark satellites of stars, cosmic gamma-ray bursts, dark matter and dark energy. Some of these topics are covered in this reprint, which includes articles written by well-known experts in astrophysics and contains both research and review articles. It will be useful for both researches in the field of astrophysics and graduate students who are only beginning to choose the subject of their own research.

> **Nazar R. Ikhsanov, Galina L. Klimchitskaya, and Vladimir M. Mostepanenko** *Editors*
