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The Nature of Comets.- Halley#x2019;s Comet Through the Ages.- The Greatest Comets of Ancient Times.- The Greatest Comets from A.D. 1000 to 1800.- The Greatest Comets from 1800 to Present Times.- Kamikaze Comets: The Kreutz Sungrazers.- Daylight Comets.
Naked-eye comets are far from uncommon. As a rough average, one appears every 18 months or thereabouts, and it is not very unusual to see more than two in a single year. The record so far seems to have been 2004, with a total of five comets visible without optical aid. But 2006, 1970, and 1911 were not far behind with a total of four apiece. Yet, the majority of these pass unnoticed by the general public. Most simply look like fuzzy stars with tails that are either faint or below the naked-eye threshold. The ‘classical’ comet – a bright star-like object with a long flowing tail – is a sight that graces our skies about once per decade, on average. These ‘great comets’ are surely among the most beautiful objects that we can see in the heavens, and it is no wonder that they created such fear in earlier times. Just what makes a comet ‘‘great’’ is not easy to define. It is neither just about brightness nor only a matter of size. Some comets can sport prodigiously long tails and yet not be regarded as great. Others can become very bright, but hardly anyone other than a handful of enthusiastic astronomers will ever see them. Much depends on their separation from the Sun, the intensity of the tail, and so forth.
Format
PDF-ebook
Sprache
englisch 
Altersgruppe
02-99
Seiten
260
Dateigröße
4.1 MB
abrufbar
24 Monate
Kopierschutz
Adobe DRM
Verlag
Springer New York
Erscheinungsort
NY/US
Ausgabe
Ausgabe
Artikel
DG2143725

'The Greatest Comets in History' von David A.J. Seargent ist ein digitales PDF ebook zum direkten download auf PC, Mac, Notebook, Tablet, iPad, iPhone, Smartphone, eReader - nicht aber auf Kindle. Sie benötigen eine DRM-fähige Reader-Ausstattung.

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