Features of the origin of $\gamma$-lines under cosmic conditions, the methodology of cosmic $\gamma$-spectroscopy, and the characteristics of $\gamma$-spectrometers are discussed. Observational data are provided on discrete ylines caused by solar flares as well as on those arising in cosmic objects outside the solar system. A possible interpretation of the detected $\gamma$-lines is discussed. In closing the article, the prospects of cosmic $\gamma$-spectroscopy are analyzed.

@article{Rozental’:1979,
	author = {I. L. Rozental’ and V. V. Usov and I. V. Éstulin},
	title = {Cosmic γ-spectroscopy},
	publisher = {Physics-Uspekhi},
	year = {1979},
	journal = {Phys. Usp.},
	volume = {22},
	number = {1},
	pages = {46-60},
	url = {https://ufn.ru/en/articles/1979/1/c/},
	doi = {10.1070/PU1979v022n01ABEH005415}
}