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Search results for: comet in all categories

1158 results found.

116 pages of results.
61. The Jets of Hale-Bopp [Thunderbolts Website]
... home updates news and views picture of the day resources team a role for you contact us picture of the day archive subject index subject abstracts Credit: N. Thomas (MPAE) et al., 1.5-m La Silla Telescope, ESO Dec 29, 2006 The Jets of Hale-Bopp When the comet Hale-Bopp began discharging beyond the orbit of Jupiter, it marked the beginning of the end for standard comet theory. One of the observations leading to the dirty snowball theory of comets was that most of the periodic comets begin to grow tails at about the same distance from the Sun: between Jupiter and Mars. The determining factor was thought to be the distance at which the comet became hot enough for water and other volatile substances to evaporate into space, creating the coma, or "head," and tail of the comet. But not every comet obeys even this tenuous "dirty snowball" criterion. Hale-Bopp in particular broke many of the rules. In the photo seen here, it is still too far from the sun for a "snowball" to melt ...
Terms matched: 1  -  Score: 165  -  29 Dec 2006  -  12k  -  URL:
... From: Aeon V:4 (July 1999) Home¦ Issue Contents Comets, Polular Culture, and the Birth of Modern Cosmology by Sara Genuth (Princeton, 1997) Reviewed by Ev Cochrane Few things in life are as memorable and charged with unconscious emotion as the appearance of a brilliant comet. From time immemorial, comets have inspired dread and been associated with ominous portents. Ancient Babylonian astronomical texts link comets to the death of kings and other calamities. Similar views were common among the Greeks and Romans. Of a comet that appeared during Nero's reign, Tacitus wrote as follows: "A comet blazed into view-- in the opinion of the crowd, an apparition boding change to monarchies. Hence, as though Nero were already dethroned, men began to inquire on whom the next choice should fall." [8 In order to assuage the panicked populace and preserve his power, Nero had his potential rivals slain in an orgy of blood and deceit. That such beliefs persisted well into modern times is confirmed by Shakespeare's famous passage: " ...
Terms matched: 1  -  Score: 165  -  05 Mar 2003  -  8k  -  URL:
63. “Stardust” Shatters Comet Theory [Thunderbolts Website]
... home updates news and views picture of the day resources team a role for you contact us picture of the day archive subject index subject abstracts This image shows a comet particle collected by the Stardust spacecraft. The particle is made up of the silicate mineral forsterite, also known as peridot in its gem form. It is surrounded by a thin rim of melted aerogel, the substance used to collect the comet dust samples. The particle is about 2 micrometers across. Credit: NASA/JPL-Caltech/University of Washington. Dec 05, 2006 “Stardust” Shatters Comet Theory (This TPOD first ran on March 16, 2006) The first results from NASA's Stardust mission are in, leaving mission scientists in a state of shock and awe. The tiny fragments of comet dust brought back to Earth did not accrete in the cold of space, but were formed under “astonishingly” high temperatures. It seems that the gulf between the impressive successes of modern technology and the depressing failure of theory has grown by another giant leap. NASA s celebrated Stardust mission ...
Terms matched: 1  -  Score: 165  -  05 Dec 2006  -  17k  -  URL:
64. The Jets of Comet Wild 2 [Thunderbolts Website]
... home updates news and views picture of the day resources team a role for you contact us Credit: Stardust Team, JPL, NASA home pic of the day archive subject index abstract archive Links: Holoscience Electric Cosmos The Universe Plasma Cosmology Society for Interdisciplinary Studies educational resources Aeon Journal Dec 08, 2004 The Jets of Comet Wild 2 NASA's Stardust spacecraft snapped these photos of Comet Wild 2 on January 2, 2004. On the left is the comet nucleus and on the right a composite of the nucleus and a longer exposure highlighting the comet's jets. According to a recent press release, project scientists expected "a dirty, black, fluffy snowball" with a couple of jets that would be "dispersed into a halo". Instead they found more than two dozen jets that "remained intact "-they did not disperse in the fashion of a gas in a vacuum. Some of the jets emanated from the dark unheated side of the comet-an anomaly no one had expected. Chunks of the comet, some as big as bullets, blasted the spacecraft as it crossed ...
Terms matched: 1  -  Score: 165  -  29 Nov 2006  -  9k  -  URL:
... upon it. When measurements are processed through the model any differences between nature and the model can be extra forces acting. Where these forces can be applied to specific Solar System bodies at particular locations (say, another planet, a satellite, an asteroid, or the like) the extra force can be termed a gravitational perturbation. When it cannot be ascribed so, then by definition there is need for a non-gravitational force to sustain the model. Non-gravitational forces are ascribed to things like episodic directional splutters of gas or matter from comet nuclei. Such outbursts ought to disturb a comet's motion slightly (and sometimes randomly), thereby explaining bothersome saltations, especially in the motion of some comets. When one is predicting the motion of a comet, one first calculates all of the disturbances expected for the comet's orbit as it passes the scattered planetary positions for the time of its passages. These are the gravitational perturbations. Usually a small difference still persists between the predicted and the observed path and motion along that path for the comet. Now, non-gravitational forces are ...
Terms matched: 1  -  Score: 165  -  05 Mar 2003  -  14k  -  URL:
66. Comments on Chappell [Catastrophism & Ancient History Journal $]
... From: Catastrophism and Ancient History XIV:1 (Jan 1992) Home¦ Issue Contents LETTERS TO C&AH JOURNAL Comments on Chappell Sam Windsor Dear Marvin: I think Mr. Chappell (The Day The Sun Stood Still: A Comparative Analysis, Jr. C& A H July 1991, pg. 102) is to be congratulated on a well written and researched article. He is on the right path. The postulation that Joshua's long day was caused by a comet and not by Mars, however, has several weaknesses that should be accounted for. These weaknesses are: We haven't seen comets in the solar system with enough mass to significantly torque the Earth's crust and modify the spin axis poles. Even the Earth's Moon would have to impact the Earth (get within Earth's Roche limit) to deform the crust enough to cause a drag that would curl the magma in a Coreolis deflection and result in a changed spin axis. Not only has there never been a really large comet reported once, but it needs to have repeatedly attacked Earth ...
Terms matched: 1  -  Score: 165  -  05 Mar 2003  -  8k  -  URL:
67. 2nd SIS Cambridge Conference Abstracts [SIS Internet Digest $]
... phase of their physical evolution and heliocentric distance. This paper reviews progress towards understanding the nature of the NEO population, particularly whether the source flux is principally cometary or asteroidal, and assesses the question of probable time-dependence in the flux and size distribution of the impacting objects. Evidence for impacts in the astronomically recent past and of historical variations in the NEO population will be briefly discussed. 9:45 Bill Napier, Armagh Observatory Cometary Catastrophes, Cosmic Dust and Ecological Disasters in Historical Times: The Astronomical Framework Available data from fireball and comet observations, meteorite impacts, small lunar craters and the current near-Earth environment are assembled to yield a coherent picture of the interface between the Earth and its current interplanetary environment. The Taurid Complex of meteors, meteoroids, asteroids and Comet Encke has probably been a significant and regularly visible celestial hazard from the last Ice Age through to the present day. These data lead to the expectation that history has been punctuated by: (I) Tunguska-like impacts, singly or as part of fireball swarms; (ii) freezing events of decadal ...
Terms matched: 1  -  Score: 165  -  05 Mar 2003  -  18k  -  URL:
68. ABSTRACTS JANUARY 2006 [Thunderbolts Website]
... a role for you contact us ABSTRACTS FEBRUARY 2006 home pic of the day archive subject index abstract archive Links: Holoscience Electric Cosmos The Universe Plasma Cosmology Society for Interdisciplinary Studies educational resources Aeon Journal Feb 28, 2006 In the Dark on Matter Fabulous Matter and Energy Since there is no experimental or observable evidence that dark matter exists, is it just a prop for the beleaguered big bang theory? This highly speculative construct is now combined with one just as fabulous --dark energy --to shore up current cosmological dogma. Feb 27, 2006 The Comet and the Future of Science Though NASA officials have said nothing on the subject, astronomy today is on the edge of a critical shift in perception a revolution that could redefine our view of the heavens. Feb 17, 2006 Deep Impact Where s the Water? (3) A Unified Explanation of “Water” Production Feb 16, 2006 Deep Impact Where s the Water? (2) The Comet as a “Water” Factory Feb 15, 2006 Deep Impact and Shoemaker-Levy 9 To place the ...
Terms matched: 1  -  Score: 165  -  29 Nov 2006  -  19k  -  URL:
... THOTH -A Catastrophics Newsletter- VOL I, No. 17 June 30, 1997 EDITOR: Michael Armstrong PUBLISHER: Walter Radtke CONTENTS: VELIKOVSKY'S COMET VENUS...David Talbott PLANET'S TAIL OF THE UNEXPECTED...Jeff Hecht RALPH SANSBURY'S GRAVITY...Wal Thornhill GRAVITY NEWS ITEM.... Ian Tresman New URL Section---- Quote of the day: "New opinions are always suspected and usually opposed without any other reason but because they are not already common knowledge." John Locke---- VELIKOVSKY'S COMET VENUS David Talbott ( [EDITOR'S NOTE: This is the first in a series of articles on the myth of the comet Venus.In _Worlds in Collision_, Velikovsky noted many tales of disaster and upheaval in which the agent of destruction possesses cometary attributes, even as it is identified with the _planet_ Venus. The anomalous "cometary" traits of Venus in world mythology thus became key pieces of the argument, and the strength of the argument derived from the breadth of sources. ...
Terms matched: 1  -  Score: 165  -  21 Mar 2007  -  19k  -  URL:
... a successful scientific prediction-- the ultimate test of any theory. The first half of this book is a comparatively low-key discussion of the Earth's place in the Galaxy, the nature of comets, and the possible role of cometary impacts in causing mass extinctions of life on Earth, triggering ice ages, and producing geological changes such as reversals of the Earth's magnetic field. But having established their credentials and their theme, Clube and Napier then proceed to the heart of the matter. The authors argue that in recent prehistory a major comet, or comets, was deflected into the inner part of the Solar System and made many passes around the Sun before it disintegrated.* For hundreds of years, at more or less regular intervals, this provided spectacular heavenly displays as viewed from Earth, and from time to time fragments of the comet collided with our planet. Weaving a cloth from threads of Greek, Biblical, and Egyptian history, Clube and Napier argue convincingly that many of the myths and legends of ancient times can be explained in terms of the evolution ...
Terms matched: 1  -  Score: 160  -  05 Mar 2003  -  48k  -  URL:
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