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Since the dawn of mankind, observers of the sky have wondered at the sudden appearance of new stars on the seemingly unchanging heavens and, for at least 2000 years, have recorded these phenomena in their annals and archives. Even in more modern times, since the discovery of SN1885A in S Andromeda which ?gured in the important “island universe” discussions of the 1920’s, the puzzle of supernovae (SNe) has played an important role in astrophysics. Only with the seminal work of Fritz Zwicky and Walter Baade in the 1930’s did we begin to understand the di?erences between novae and SNe and the importance of SNe as the fonts of energy for the interstellar medium and as drivers of chemical...
A comprehensive and timely review of studies of supernovae and supernova remnants.
It was a general feeling among those who attended the NATO / ARW meeting on the Galaxy Distances and Deviations from Universal Expansion, that during the week in Hawaii a milestone had been passed in work on the distance scale. While not until the last minute did most of the participants know who else would be attending, no one was displeased with the showing. As it turned out, scarcely a single active worker in the field of the distance scale missed the event. Few knew all of the outstanding work that was to be revealed, and/or the long-term programs that were to be encapsulated in the first few days. Areas of general agreement were pinpointed with candid speed, and most of the discussion m...
Proceedings of the NATO Advanced Research Workshop (Fifth Moriond Astrophysics Meeting), Les Arcs, France, March 17-23, 1985
Up until now, mountain ecosystems have not been closely studies by social scientists as they do not offer a readily defined set of problems for human exploitation as, do for instance, tropical forests or arctic habitats. But the archaeological evidence had shown that humans have been living in this type of habitat for thousands of year. From this evidence we can also see that mountainous regions are often frontier zones of competing polities and form refuge areas for dissident communities as they often are inherently difficult to control by centralized authorities. As a consequence they fuel or contribute disproportionately to political violence. But we are now witnessing changes and increas...