Posted on 04/02/2006 2:13:59 PM PDT by SunkenCiv
Did a planetary wobble kill the dinosaurs?Bruce Runnegar from the University of California at Los Angeles' Center for Astrobiology... and his colleagues used computer models to map out the Solar System for the past 250 million years. In particular, they looked at the perihelion of each planet - the point in its orbit where it is closest to the Sun. The perihelion of Earth rotates around the Sun with a period of hundreds of thousands of years. Because of subtle tugs and pulls between the planets, this period changes slightly with time... Their model suggests one of these blips significantly changed Mercury's orbit 65 million years ago. This wobble would have pulled at the asteroid belt, increasing the chances that asteroids in the Hungarias region would be knocked out of place. Now the researchers are running a fresh set of models to see how much the orbits of these asteroids changed. It wouldn't have been enough to send a shower of asteroids into the Earth, but Runnegar says the wobble could have sent a single asteroid onto collision course with our planet... Now he is planning to run his models forward in time, to see when the next potentially catastrophic planetary wobble will be.
by Nicola Jones
New Scientist
June 27 2001
Is Phoebe A Kuiper Belt Object?Phoebe is a 200 km scale irregular satellite of Saturn. With a retrograde orbit (inclination 178 deg), Phoebe cannot have formed in a Saturn-associated accretion disk and, instead, is inferred to have been captured from an independent orbit around the Sun... The two main possibilities are that... Phoebe was captured from heliocentric orbit near Saturn, probably in association with planet formation itself... OR... Phoebe was captured from a more distant reservoir, possibly the Kuiper Belt. We do not possess any way to decide clearly between these possibilities. Recently, Kuiper Belt capture has been widely publicised and two (not wholly convincing) strands of evidence have been supplied.
by David Jewitt
Last updated Jun 2006
Weighed in being the appropriate metaphor, considering who's on the cover. ;')
Earth's Oxygen EnigmaScientists have long believed that blue-green algae arose 3.5 billion years ago, pumping out oxygen and causing the oceans to fill with rust. Over the next billion years the algae transformed Earth's atmosphere, allowing oxygen-breathing life to evolve. Carrine Blank of Washington University in St. Louis... compared genetic sequences from 53 different groups of bacteria -- including blue-green algae, also known as cyanobacteria -- to construct a detailed family tree. The results confounded her expectations. "Cyanobacteria arose fairly late, about 2.2 or 2.3 billion years ago. That explains why we see this very sudden increase in oxygen, around 2.2 to 2 billion years ago, which has always been a big mystery," she says. The finding implies that something else caused the ocean rusting.
by Kathy A. Svitil
February 11, 2003
Carrine Blank of Washington University in St. Louis
Comet's course hints at mystery planet [ from 2001 ]
Govert Schilling | last updated February 5th, 2002 | Govert Schilling
Posted on 08/18/2006 5:36:59 PM EDT by SunkenCiv
http://www.freerepublic.com/focus/f-chat/1686125/posts
Four theoretical causes of the Permian extincion event.
To what extent could the first event have triggered one or more of the other three effects?
ping, many celestial articles, including impact.
Hydrogen sulfide is found at depth in the oceans, either as a product of inorganic processes deep in the Earth, or as a biological byproduct. A large ocean impact (or a series of impacts from a former single object that broke up) would release that. However, with large impacts, that wouldn't be the only problem. :')
one of those old-fashioned topics, with a catastrophism focus:
The Origin of Sex: Cosmic Solution to Ancient Mystery
Source: Reuters
Published: Tuesday July 10 09:57 AM EDT
Author: Robert Roy Britt, Senior Science Writer, SPACE.com
Posted on 07/11/2001 09:23:06 PDT by Junior
http://www.FreeRepublic.com/forum/a3b4c7d6a4873.htm
[original, dead link]
http://dailynews.yahoo.com/h/space/20010710/sc/the_origin_of_sex_cosmic_solution_to_ancient_mystery_1.html
[also at http://www.space.com/scienceastronomy/solarsystem/origin_sex_010710.html ]
regarding:
http://www.freerepublic.com/focus/f-bloggers/1607979/posts?page=137#137
http://exoplanet.eu/star.php?st=HD+149026
25 Nov 06: Wright et al 2006 raise doubts about this planet
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Earth stretched by seasonal water movementEach winter, snow and soil moisture accumulates in cold polar regions and the atmosphere becomes denser. The elastic body theory predicts that this extra weight should slightly compress the hemisphere experiencing winter. In the north, the maximum compression should occur in February or March, when the most water has accumulated. The polar region should then dry out during spring and summer, while moisture settles out at the opposite pole. The result is an annual oscillation of Earth's shape. And this is exactly the pattern shown in the GPS data. Sites near the north pole sank up to three millimeters in February and March, while regions near the equator moved about 1.5 millimeters north. Then the cycle reversed, with moisture accumulating near the south pole causing it to sink about three millimeters during the southern hemisphere's winter in August and September... Once they understood the oscillation pattern, the geophysicists were able to estimate that a load of about 1016 kilograms shifts between the hemispheres each year.
by Jeff Hecht
December 28, 2001
New Scientist
Yeah, book mutilation is a scholarly practice."Rogue Asteroids and Doomsday Comets" by Duncan SteelAlthough Steel disarmingly introduces Chapter 8 as devil's advocacy that "many will find bizarre," he has a more serious purpose: it is to gain some acceptance (in this case concerning the distant past, which will always be shrouded in uncertainty) of a theory, promoted by Steel's British colleague Victor Clube, for which the word "bizarre" would be an understatement. Clube believes that the modern history of Western civilization (one example is the Protestant reformation) has been shaped chiefly by comet storms which, furthermore, he believes are increasing at the present time. Indeed, Steel himself approvingly quotes Clube's theory that the Dark Ages commenced as a result of "conflagrations" due to the so-called Taurid complex of meteors and comet fragments.
review by Clark R. Chapman
1996
Here is where professional meteoriticists and planetary scientists should take note. Steel attributes many impact occurrences (including the Farmington meteorite and the Tunguska blast) to the Taurid complex, an ill-defined and inherently difficult- to-observe heterogeneous belt of debris, orbiting in the inner solar system, derived from a giant comet that he believes was disrupted about 5,000 years ago. Encke's comet and several meteor showers are the primary observables. A theme that runs through this book, and pops up in subdued form even in some of the chapters I label as being authoritative, is that coherent clusters or streams of cometary debris -- the Taurid complex is a particular, current example -- somehow dominate the terrestrial impact rate, and invalidate the average rates (and hence hazard of future impacts) deduced by Gene Shoemaker and others...
...In conclusion, I recommend buying "Rogue Asteroids and Doomsday Comets" along with a pair of scissors. Cut out and throw away pp. 60-64 and 70-73 from Chapter 4, pp. 114-116 and 125-136 from Chapter 7, and all of Chapters 6 and 8. Then have an enjoyable read, being just a little wary, however, whenever the Taurid complex is mentioned.
I think that a case can be made that sometime about 5000 years ago men all over the world began to look up.
And this — not just because of the datings of things like stonehenge or various astronomical megaliths around the world but also because sailors from different races civilzations and opposite ends of the earth —navigating by the stars — arrived in Hawaii within 1000 years of each other. In dog years that a lot—but in the broader scheme of things its not.
Coastal sailing has been around maybe 50,000 years.
Comet Shoemaker-Levy 9In 1992, SL 9 passed by Jupiter within the Roche limit. It was broken into at least 21 separate fragments which were dispersed several million kilometers along its orbit... The estimates range from 2 to 10 km in diameter for the original body and from 1 to 3 km for the largest fragments. Between 16 July 1994 and 22 July 1994 the fragments impacted the upper atmosphere of Jupiter. This was the first time that scientists had an opportunity to witness the collision of two extraterrestrial bodies... The after-effects of the impacts were visible on Jupiter for nearly a year after the event. There are linear chains of craters on Ganymede and Callisto that are believed to have been formed by the impacts of bodies similar to SL 9.
The Nine Planets
(that's right, Nine, wanna make somethin' of it?!? ;')
[and from the Students for the Exploration and Development of Space (SEDS) website] On 1994 July 16-22, over twenty fragments of comet Shoemaker-Levy 9 collided with the planet Jupiter. The comet, discovered the previous year by astronomers Carolyn and Eugene Shoemaker and David Levy, was observed by astronomers at hundreds of observatories around the world as it crashed into Jupiter's southern hemisphere. This Web site is here to provide some of the images taken by amateur and professional astronomers before, during, and after the events, and to provide more information on this historic event.
According to the NTSB (report here), there were in 2006 (latest figures available) 50 fatalities recorded for US air carriers.
Where does one look for numbers on asteroid / comet impact fatalities?
Thanks for the ping. I had not run across this thread before. Excellent compendium on catastrophism.
The horizon. When you see the tongue of flame, start counting backwards from 1000. ;’)
Thanks. This is the ‘blog topic for the ping list. :’)
OK, truly funny. I have to buy a new keyboard.
By the way, thanks for all the work you do with the Catastrophism and GGG ping lists. For me, these are consistently the most interesting reading on Free Republic. (A lot of other stuff is consistently the most blood-pressure raising! ;-)
My pleasure, sorry about the keyboard... ;’)
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Ongoing research places the Holocene Working Group under the watchful eyes of scientists as they attempt to prove their large-scale meteor collision theories.
During the past day or so, the following topics had the ‘catastrophism’ keyword removed by FR staff (similar mass removals of the ggg keyword occurred at least three times in 2005 I think it was):
Ancient Crash, Epic Wave
NY Times | November 14, 2006 | SANDRA BLAKESLEE
Posted on 11/14/2006 7:07:33 AM EST by Pharmboy
http://www.freerepublic.com/focus/f-news/1738251/posts
Did an Asteroid Impact Cause an Ancient Tsunami?
NYT | Nov 14 2006 | SANDRA BLAKESLEE
Posted on 11/15/2006 11:00:40 PM EST by djf
http://www.freerepublic.com/focus/f-news/1739396/posts
Apocalypse soon?
San Berdoo Sun dotcom | 08/11/2007 12:19:22 AM PDT
Posted on 08/17/2007 12:39:09 AM EDT by BenLurkin
http://www.freerepublic.com/focus/f-chat/1882399/posts
Discovery of Vast Tail on Dying Star Promises Clues to Solar Birth
The Washington Post via Drudge Report | August 16, 2007 | Marc Kaufman
Posted on 08/15/2007 10:42:32 PM EDT by RDTF
http://www.freerepublic.com/focus/f-chat/1881836/posts
Earthquake Magnitude 6.6 - CENTRAL MID-ATLANTIC RIDGE
USGS | August 20, 2007
Posted on 08/20/2007 7:21:31 PM EDT by bd476
http://www.freerepublic.com/focus/f-news/1884037/posts
Hot tempers on global warming
boston.com | August 15, 2007 | By Jeff Jacoby
Posted on 08/17/2007 10:18:52 PM EDT by Reform Canada
http://www.freerepublic.com/focus/f-news/1882899/posts
Living Fossils, Rooted in Antiquity
star ledger | KITTA MacPHERSON
Posted on 08/20/2007 9:04:45 PM EDT by Coleus
http://www.freerepublic.com/focus/f-news/1884098/posts
Lost Civilisation From 7,500 BC Discovered Off Indian Coast
Ananova | 1-16-2002
Posted on 01/16/2002 8:18:59 AM EST by blam
http://www.freerepublic.com/focus/f-news/609248/posts
‘Lunar Ark’ Proposed In Case Of Deadly Impact On Earth
National Geographic | 8-14-2007 | Kevin Holden Platt
Posted on 08/16/2007 5:57:05 PM EDT by blam
http://www.freerepublic.com/focus/f-news/1882237/posts
New Dinosaur Species Found in India
AP | August 13, 2003 | RAMOLA TALWAR BADAM
Posted on 08/14/2003 12:02:05 AM EDT by nwrep
http://www.freerepublic.com/focus/f-news/963744/posts
NSF Press Release: Comet May Have Exploded Over North America 13,000 Years Ago
National Science Foundation Press Release | August 14, 2007 | Cheryl Dybas, NSF
Posted on 08/15/2007 8:32:04 PM EDT by baynut
http://www.freerepublic.com/focus/f-news/1881784/posts
Supernova Storm Wiped Out Mammoths?
Discovery News | Sept. 28, 2005 | Jennifer Viegas
Posted on 10/17/2005 11:57:32 AM EDT by Fzob
http://www.freerepublic.com/focus/f-news/1503957/posts
Tourists hurt by giant wave after Arctic glacier breaks
Reuters on Yahoo | 8/9/07 | Reuters
Posted on 08/09/2007 1:06:54 PM EDT by NormsRevenge
http://www.freerepublic.com/focus/f-chat/1878764/posts
Did the new moon lose its iron heart?The current theory says that the material that now forms our moon was ejected when Earth was struck by another planet-sized body. But Peter Noerdlinger at Saint Mary's University in Halifax, Canada, says this theory has problems. "The collision has to be implausibly gentle. You practically need someone to hold a Mars-sized object just above Earth and drop it, to avoid messing up Earth's orbit."
New Scientist
January 23, 2007
The simpler idea that Earth and the moon were both created from the same gas cloud had been rejected because it could not explain why Earth formed an iron core and the moon did not. Now, Noerdlinger has an answer for that.
He suggests that the proto-moon did have an iron core, but that the satellite was ripped apart in a close encounter with Earth. His calculations show that iron from the core would be pulled towards Earth, while the remains of its rocky outer shell reassembled into our iron-free moon.
This fits with evidence that the Earth acquired a veneer of iron after it formed, Noerdlinger says. He presented the work at the American Astronomical Society meeting in Seattle, Washington, last week.
From issue 2587 of New Scientist magazine, 23 January 2007, page 16
cosmic ray bombardment:
Astronomy Picture of the Day 9-12-02
NASA | 9-12-02 | Robert Nemiroff and Jerry Bonnell
Posted on 09/12/2002 1:37:17 AM EDT by petuniasevan
http://www.freerepublic.com/focus/f-chat/749126/posts
Bright star: Four centuries later, fresh insight into historic find
Yahoo (AFP) | Wed Oct 27, 2:00 PM ET
Posted on 10/30/2004 3:09:45 AM EDT by Thinkin’ Gal
http://www.freerepublic.com/focus/f-news/1262401/posts
Discovery 2008The hypothesis suggests that collisions between large objects like Pluto and Eris and others out in the Kuiper belt played a much larger role in sculpting these objects than anyone previously thought, and, in particular, the collisions removed much of the ice that these cold objects would have had in their interiors... For my hypothesis there are two tests. The first is to show that a giant collision indeed removes ice. The second is to show that an object that has a lot of ice didn't have a giant collision... In my hypothesis, this giant collision that happened on Quaoar long ago should have removed most of the ice inside of Quaoar, meaning that the interior should be much more rock than ice... If Quaoar is heavy and rock-like, [its] moon will be pulled along quickly, while if Quaoar has more ice and is lighter, the moon will take longer to go around... Another giant Kuiper belt objet and dwarf planet, Orcus..., also has a moon... For my hypothesis to be correct, this moon must be captured, because otherwise my hypothesis would predict that Orcus should be rocky, not icy... Like the first test, the results of this second test will be apparent almost instantly. In only a few hours I should be able to figure out what the moon of Orcus has on its surface. If the moon of Orcus looks like it was made in a collision I will again have to toss the hypothesis out. But if the moon appears captured, the hypothesis will have survived two important tests, and it will suddenly have to be considered seriously.
Mike Brown's Planets
Monday, December 31, 2007
I think he's trying to say this is hugh and series, isn't he?
Heh... the whole thing reminds me of “theory, by Anne Elk”.
Oh no, not more homework! Give me a hint...
Monty Python. :’)
Baggage Train from Egypt
Anomalous Trajectories of deep space probes
Thunderbolts.info | 03/04/2008
Posted on 03/16/2008 5:22:27 AM EDT by Swordmaker
http://www.freerepublic.com/focus/f-chat/1986454/posts
The “Galactic Mask” Unveiled
thunderbolts.info | 03/12/2008
Posted on 03/16/2008 6:11:29 AM EDT by Swordmaker
http://www.freerepublic.com/focus/f-chat/1986459/posts
Mira: The Tale of a Giant Star... with a tail
thunderbolts.info | 03/03/2008 | Stephan Smith
Posted on 03/16/2008 5:11:17 AM EDT by Swordmaker
http://www.freerepublic.com/focus/f-chat/1986453/posts
Saturn’s Plasma Ring
Thunderbolts.info | 03/06/2008 | Stephan Smith
Posted on 03/16/2008 5:49:59 AM EDT by Swordmaker
http://www.freerepublic.com/focus/f-chat/1986456/posts
When Winds Collide
thunderbolts.info | 03/07/2008 | Stephan Smith
Posted on 03/16/2008 5:59:55 AM EDT by Swordmaker
http://www.freerepublic.com/focus/f-chat/1986457/posts
Highly recommended if you can tear yourself away from Flagstaff and Canyon de Chelly.
Cheers!
If ever I ride through there again, I plan to check it out. 3/4 a mile across? More than just a big hole in the ground. :’)
Added blam just the one time. A couple of links, no biggie:
Evidence for an extraterrestrial impact 12,900 years ago that contributed to the megafaunal extinctions and the Younger Dryas cooling
http://www.pubmedcentral.nih.gov/articlerender.fcgi?artid=1994902
http://www.pnas.org/cgi/reprint/0706977104v1.pdf
Chicxulub and the Cretaceous Tertiary Boundary
http://www.lpl.arizona.edu/SIC/impact_cratering/Chicxulub/Chicx_title.html
Thanks. Bookmarked to read during the next blizzard.
Vulcan and Comets Related Sites
Comet/Earth Impact Chronology
28 February 2008
http://www.barry.warmkessel.com/barry/4related.html
Recent events:
http://www.barry.warmkessel.com/barry/Feb08toJun08events.html
including:
The goose that survived crashing into a meteorite only to be savaged by a fox!
February 5th, 2008 - 5:14 pm ICT by admin
London, Feb 5 (ANI): A goose survived being hit by a 9lb meteorite and crashing into a car only to fall prey to a hungry fox.
And, witness to all this was Brit postman Adrian Mannion who was enjoying his morning cup of tea with wife Fiona when the bizarre set of events unfolded.
According to Mannion, the Canada Goose was left dazed when after banging into a meteorite, it fell headlong into his cars roof, causing 2,500 pounds worth of damage.
However, there was no reprieve for the bird, for a hungry fox then grabbed it dragged it away before the Mannions could rescue it.
We heard two almighty thuds and rushed out to see this large, odd-looking rock next to our Mini and a very poorly-looking mangled goose on the car roof, The Sun quoted Mr Mannion, as saying.
A flock of Canada Geese were overhead so the falling stone must have hit the poor creature.
Mrs Mannion added: It has to be the unluckiest bird ever. It survived being knocked out by a meteorite only to be savaged by a fox.
The meteorite is now being studied by researchers at the University of Derby. It is one of only 1,000 asteroid fragments that hit earth each year. (ANI)
from the History Channel:
http://www.youtube.com/v/EiXpp-i442s&hl=en
A FReeper posted this link (thought gleeaikin did, but didn’t see it):
Eruptions ‘blog:
http://eruptions.wordpress.com/
Many astronomical links ping
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