‎"MALAISE, D. J.‎
‎Collisional effects in cometary atmospheres I. Model Atmospheres and Synthetic Spectra. - [THE INNER COMA OF COMETS]‎

‎(Berlin & New York, Springer), 1970. Royal8vo. In the original blue wrappers. In ""Astronomy and Astrophysics"", Volume 5, No. 2, April 1970. Entire issue offered. A very fine and clean copy. Pp. 209-27. [Entire issue: Pp. (2), 171-334].‎

Reference : 49354

‎First printing of Malaise's important paper in which he for the first time presented convincing evidence for the inner coma of comets""A comet's nucleus is like a dirty snowball made of ice. As the comet gets closer to the Sun, some of the ice starts to melt and boil off, along with particles of dust. These particles and gases make a cloud around the nucleus, called a coma. The coma is lit by the Sun. The sunlight also pushes this material into the beautiful brightly lit tail of the comet."" (NASA)‎