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An explanation is proposed for the observed and often discussed clustering of long-period comet aphelia on the sky. Poisson and several multinomial distributions are applied to the most conspicuous cluster, considering only the 80 "new" and 59 "intermediate" comets with the best-determined orbits. The observed number of aphelion points in adjacent areas in(More)
Comets are kilometer-sized icy conglomerates of frozen gases and dust particles which move around the Sun in an assembly called “Oort's cloud” in the outer parts of the planetary system. Only those which are ejected towards the Sun by the perturbations of passing stars will evaporate gases and dust while they are near the Sun. This material forms the large(More)
Auch tiber die Stoffwanderung in den Markstrahlen, den radialen Transportsystemen (Fig. 15), wissen wir noch wenig. Die Bestimmung der Wandergesckwindigkeit von ~C-markierter Glucose in StOrmmen yon Robinie und Buehe hat aber ergeben, dab auch hier die Triebkraft einer normalen Diffusion nicht ausreicht I~9~. Uber die Natur des Beschleunigungsmechanismus(More)
Non-periodic comets come from regions at the limit of our solar system and have conserved their original structure and composition since they have originated from a pre-solar nebula together with the sun and the planets about 4.5·109 years ago. They are icy bodies of kilometer size whose structure and chemical composition is of great interest, also with(More)
Im Februar 1965 wurde das neue Geb~ude des Instituts fiir extraterrestrische Physik am Max-PlanckInstitut ftir Physik und AstropEysik in Miinchen fertiggestellt. Dieses Insti tut ist aus dem Insti tut far Astrophysik hervorgegangen, nachdem sich schon 1960 in der Max-Planck-Gesellschaft eine Arbeitsgemeinschaft fiirWeltraumforschung gebildet hatte, an der(More)
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