Results 201 to 210 of about 2,214 (245)
Some of the next articles are maybe not open access.
Celestial Mechanics and Dynamical Astronomy, 1992
Reasons for interest in the origin of short-period comets and the difficulties of computing their long-term dynamical evolution are reviewed. The relative advantages of a source region in an extended ‘inner core’ of the Oort cloud or a compact ‘comet belt‘ just beyond the planetary system are finely balanced, and it is premature to consider the problem
openaire +1 more source
Reasons for interest in the origin of short-period comets and the difficulties of computing their long-term dynamical evolution are reviewed. The relative advantages of a source region in an extended ‘inner core’ of the Oort cloud or a compact ‘comet belt‘ just beyond the planetary system are finely balanced, and it is premature to consider the problem
openaire +1 more source
2013
Originally published in 1953, this book first sets out some observational facts about comets, then the greater part of the book accounts for their origin and explains how comet tails are formed. The text contains 34 photographs of celebrated comets, including eight of Halley's comet. A comet index is also provided.
openaire +1 more source
Originally published in 1953, this book first sets out some observational facts about comets, then the greater part of the book accounts for their origin and explains how comet tails are formed. The text contains 34 photographs of celebrated comets, including eight of Halley's comet. A comet index is also provided.
openaire +1 more source
2017
It was not only the physical nature of comets that so long remained a mystery. Their origin was also shrouded in obscurity, and the various hypotheses put forward to explain this were to some degree influenced by beliefs about their nature.
openaire +1 more source
It was not only the physical nature of comets that so long remained a mystery. Their origin was also shrouded in obscurity, and the various hypotheses put forward to explain this were to some degree influenced by beliefs about their nature.
openaire +1 more source
1981
The possible role of comets in the origin of life is reviewed both con and pro. The former viewpoint stresses our considerable ignorance of the physical and chemical state of comets. The latter position points out the possibility in some comets of an extended thermal history, which might have led to the production of biologically significant ...
Irvine, William M. +2 more
openaire +1 more source
The possible role of comets in the origin of life is reviewed both con and pro. The former viewpoint stresses our considerable ignorance of the physical and chemical state of comets. The latter position points out the possibility in some comets of an extended thermal history, which might have led to the production of biologically significant ...
Irvine, William M. +2 more
openaire +1 more source
Origin and evolution of comets
International Astronomical Union Colloquium, 1974AbstractA Monte Carlo study is described that leads to an understanding of the evolution of comets, particularly how the short-period comets can arise. Some results have appeared in the March 1972 issue of Astrophysical Letters, Vol. 10, pages 131–135 (Paper I), but further results are presented here for the first time.This is a report of a particular ...
openaire +1 more source
An Interstellar Origin for Comets
1982It is usually supposed that the outer regions of the Oort cloud have been thermalised by the cumulative effect of stellar encounters and that the long-period comets are perturbed into the inner solar system by passing stars. This heating, or relaxation, is a gentle process, Weissman (1980) for example estimating that only ∿ 9% of the primordial comet ...
openaire +1 more source