The Photosphere of the Sun -- I. The continuous spectrum -- II. The Fraunhofer spectrum -- General references -- Structure and Dynamics of the Solar Atmosphere -- A. The undisturbed photosphere and chromosphere -- B. The disturbed parts of the photosphere and chromosphere -- C. The corona -- D. Solar rotation and the solar cycle -- E. Solar and terrestrial relationship -- General references -- The Atmospheres of the Planets -- I. Introduction -- II. The Earth's atmosphere -- III. The atmosphere of Venus -- IV. The atmosphere of Mars -- V. The atmospheres of Mercury and the Moon -- VI. The atmospheres of major planets and their satellites -- VII. Conclusions -- Acknowledgment -- References -- Planetary Interiors -- I. The mass-radius relation of cold bodies -- II. Empirical features of the planets -- III. Structure and composition of the planets -- Radio Echoes from Sun, Moon and Planets -- I. Strength and characteristics of echoes -- II. Moon echoes -- III. Future possibilities -- IV. The Earth's immediate neighbourhood -- General references -- Die Kometen -- I. Einleitung -- II. Kometenbahnen -- III. Spektren und Physik der Kometen -- IV. Zur Deutung der Kometenformen -- V. Kosmogonie der Kometen -- Meteors -- 1. Introduction -- 2. Basic theory of the meteoric processes -- 3. Meteor spectra -- 4. Meteor dynamics and orbits of comets, asteroids, and meteors -- 5. Meteoritic dust -- 6. Visual meteor studies -- 7. Radio meteor techniques -- 8. Photographic meteor techniques -- 9. The masses and densities of meteoroids -- 10. Shower meteors -- 11. Sporadic meteors and the total influx -- 12. Origin of meteors, fireballs and meteorites -- 13. Meteorites -- Acknowledgments -- Sachverzeichnis (Deutsch/Englisch) -- Subject Index (English/German).