Κυριακή 31 Μαρτίου 2013
Παρασκευή 29 Μαρτίου 2013
Πέμπτη 28 Μαρτίου 2013
Τετάρτη 27 Μαρτίου 2013
Τρίτη 26 Μαρτίου 2013
Σάββατο 23 Μαρτίου 2013
Παρασκευή 22 Μαρτίου 2013
Πέμπτη 21 Μαρτίου 2013
2013 McLaren 12C Spider Challenges Snowboarder in New Short Film
McLaren 12C Spider Challenges Snowboarder in New Short Film
To mark the start of deliveries of the 12C Spider in North America, McLaren Automotive has released a new short film. Shot at the notoriously treacherous Loveland Pass in Colorado, the 12C Spider navigates the tricky, snow-covered route "racing" against professional snowboarder Chanelle Sladics.
McLaren MP4-12C Spider technical specification:
Drivetrain layout Longitudinal mid-engine, RWD
Engine configuration V8 twin turbo
Engine material Aluminium block and cylinder heads
Oiling Dry sump
Compression ratio 8.7:1
Valvetrain 32-valve, DOHC, dual VVT
Redline ( rpm) 8,500
Bore x Stroke (mm) 93 x 69.9
Engine displacement (cc): 3799
PS / rpm 625 / 7500
Torque Nm / rpm 600 / 3000-7000
PS per litre 164
Transmission 7 Speed SSG
Body structure Carbon fibre MonoCell with aluminum front and rear frames
Wheelbase (mm) 2670
Track, F/R (mm) 1656 / 1583
Length (mm) 4509
Width (mm) @ widest point: 2093
Height (mm) 1203
DIN weight (kg / lbs) 1474 / 3249
Dry weight (kg / lbs) 1376 / 3033
Dry weight with lightweight options
(kg / lbs) 1341 / 2956
Weight distribution at DIN F / R %: 42 / 58
Active aerodynamics McLaren Airbrake
Suspension ProActive Chassis Control
ProActive Chassis Control modes: Winter / Normal / Sport / Track
Powertrain modes: Winter / Normal / Sport / Track
Brakes: Cast iron discs with forged aluminum hubs (F 370mm / R 350 mm)
Wheel sizes (F / R): 19" x 8.5"J / 20" x 11" J
Tyres (F / R): Pirelli PZero 235/35 R19 / 305/30 R20
McLaren 12C Spider Challenges Snowboarder in New Short Film
To mark the start of deliveries of the 12C Spider in North America, McLaren Automotive has released a new short film. Shot at the notoriously treacherous Loveland Pass in Colorado, the 12C Spider navigates the tricky, snow-covered route "racing" against professional snowboarder Chanelle Sladics.
McLaren MP4-12C Spider technical specification:
Drivetrain layout Longitudinal mid-engine, RWD
Engine configuration V8 twin turbo
Engine material Aluminium block and cylinder heads
Oiling Dry sump
Compression ratio 8.7:1
Valvetrain 32-valve, DOHC, dual VVT
Redline ( rpm) 8,500
Bore x Stroke (mm) 93 x 69.9
Engine displacement (cc): 3799
PS / rpm 625 / 7500
Torque Nm / rpm 600 / 3000-7000
PS per litre 164
Transmission 7 Speed SSG
Body structure Carbon fibre MonoCell with aluminum front and rear frames
Wheelbase (mm) 2670
Track, F/R (mm) 1656 / 1583
Length (mm) 4509
Width (mm) @ widest point: 2093
Height (mm) 1203
DIN weight (kg / lbs) 1474 / 3249
Dry weight (kg / lbs) 1376 / 3033
Dry weight with lightweight options
(kg / lbs) 1341 / 2956
Weight distribution at DIN F / R %: 42 / 58
Active aerodynamics McLaren Airbrake
Suspension ProActive Chassis Control
ProActive Chassis Control modes: Winter / Normal / Sport / Track
Powertrain modes: Winter / Normal / Sport / Track
Brakes: Cast iron discs with forged aluminum hubs (F 370mm / R 350 mm)
Wheel sizes (F / R): 19" x 8.5"J / 20" x 11" J
Tyres (F / R): Pirelli PZero 235/35 R19 / 305/30 R20
To mark the start of deliveries of the 12C Spider in North America, McLaren Automotive has released a new short film. Shot at the notoriously treacherous Loveland Pass in Colorado, the 12C Spider navigates the tricky, snow-covered route "racing" against professional snowboarder Chanelle Sladics.
McLaren MP4-12C Spider technical specification:
Drivetrain layout Longitudinal mid-engine, RWD
Engine configuration V8 twin turbo
Engine material Aluminium block and cylinder heads
Oiling Dry sump
Compression ratio 8.7:1
Valvetrain 32-valve, DOHC, dual VVT
Redline ( rpm) 8,500
Bore x Stroke (mm) 93 x 69.9
Engine displacement (cc): 3799
PS / rpm 625 / 7500
Torque Nm / rpm 600 / 3000-7000
PS per litre 164
Transmission 7 Speed SSG
Body structure Carbon fibre MonoCell with aluminum front and rear frames
Wheelbase (mm) 2670
Track, F/R (mm) 1656 / 1583
Length (mm) 4509
Width (mm) @ widest point: 2093
Height (mm) 1203
DIN weight (kg / lbs) 1474 / 3249
Dry weight (kg / lbs) 1376 / 3033
Dry weight with lightweight options
(kg / lbs) 1341 / 2956
Weight distribution at DIN F / R %: 42 / 58
Active aerodynamics McLaren Airbrake
Suspension ProActive Chassis Control
ProActive Chassis Control modes: Winter / Normal / Sport / Track
Powertrain modes: Winter / Normal / Sport / Track
Brakes: Cast iron discs with forged aluminum hubs (F 370mm / R 350 mm)
Wheel sizes (F / R): 19" x 8.5"J / 20" x 11" J
Tyres (F / R): Pirelli PZero 235/35 R19 / 305/30 R20
Τετάρτη 20 Μαρτίου 2013
Δευτέρα 18 Μαρτίου 2013
Σάββατο 16 Μαρτίου 2013
Γάλλοι στρατιώτες με την υποστήριξη τροχοφόρων τεθωρακισμένων VBCI ανταλλάσουν πυρά με δυνάμεις ισλαμιστών
Footage of the French forces recently fighting in Mali, trying to shut down an al Qaeda weapons base. This footage was taken in the days lead-up to this event. Mali has been in the news a lot lately due to the increased tension and conflict in the region.
Παρασκευή 15 Μαρτίου 2013
Comet C/2011 L4
In early March 2013, Comet PanSTARRS became visible to the naked eye in the night sky in the Northern Hemisphere -- appearing with a similar shape and brightness as a star, albeit with a trailing tail. Up in space, however, NASA's STEREO (Solar TErrestrial RElations Observatory) has an even better view. This movie, captured by the STEREO-B spacecraft on March 9-12, shows the comet and its fluttering tail as it moves through space. The stationary planet on the right is Earth, and the moving planet on the left is Mercury. The material moving in from the left is solar wind streaming off the sun, which is out of view on the left. Comet scientists say the tail looks quite complex and it will take computer models to help understand exactly what's happening in STEREO's observations. The comet should remain visible to the naked eye through the end of March. Comet PanSTARRS (discovered June 2011) is named for the Panoramic Survey Telescope & Rapid Response System (Pan-STARRS) in Hawaii.
Τετάρτη 13 Μαρτίου 2013
Τρίτη 12 Μαρτίου 2013
Κυριακή 10 Μαρτίου 2013
Σάββατο 9 Μαρτίου 2013
Naked-Eye Comet Pan-STARRS at Its Brightest This Weekend
Naked-Eye Comet Pan-STARRS at Its Brightest This Weekend
by Miriam Kramer, SPACE.com Staff Writer
Date: 08 March 2013 Time: 06:00 AM ET
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 Close-up of comet C/2011 L4 PANSTARRS as seen from Mount Dale, Western Australia.CREDIT: Astronomy Education Services/Gingin Observatory |
A comet that just made its way into the Northern Hemisphere evening sky should be at its brightest this weekend, but it may be tricky for stargazers to see.
On Sunday (March 10), the Comet Pan-STARRS is expected to make its closest approach to the sun, potentially making the comet shine even more brilliantly when it appears at twilight low in the western sky, weather permitting. But stargazers will need a bit of preparation (not to mention a clear sky) to see the comet.
"There is a catch to viewing Comet Pan-STARRS," Amy Mainzer, the principal investigator of NASA's near-Earth object hunting NEOWISE mission at the Jet Propulsion Laboratory in Pasadena, Calif., said in a statement Thursday (March 7). "This one is not that bright and is going to be low on the western horizon, so you'll need a relatively unobstructed view to the southwest at twilight and, of course, some good comet-watching weather."
On Sunday, Comet Pan-STARRS will pass about 28 million miles (45 million km) from the sun during its close approach. The comet made its closest pass with the Earth on Tuesday (March 5) when it flew by at about 102 million miles (164 million km) from the planet. [How to see the comet]
"It will appear in the west at sunset, from around the 8th to the 13th of March 2013, and will be visible to the naked eye up to the end of the month: Comet Pan-STARRS C/2011 L4 will traverse Cetus, Pisces, Pegasus and Andromeda," Paris Observatory officials wrote in a statement Thursday, as the comet entered the Northern Hemisphere's evening sky after months of being visible from the Southern Hemisphere.
The path of Comet C/2011 L4 (Pan-STARRS) over the next month.CREDIT: Starry Night Software
Comet Pan-STARRS, which has the official designation C/2011 L4 (PANSTARRS), was discovered in June 2011 by astronomers using the Panoramic Survey Telescope and Rapid Response System (or PANSTARRS) telescope in Hawaii. The comet made its way into the inner solar system from the Oort cloud — a group of icy bodies orbiting the sun in a region that extends from just beyond the orbit of Neptune out to a distance of 93 trillion miles (150 trillion kilometers).
While Pan-STARRS may start dimming after Sunday, that doesn't mean that comet observers should put away their binoculars yet. On March 12 and 13, the comet will appear close to the moon, possibly even silhouetting it according to SPACE.com stargazing columnist Geoff Gaherty, an astronomer with the Starry Night Education night sky software company.
The progression of comet Pan-STARRS across the night sky in March 2013 is shown in this NASA graphic.CREDIT: Science@NASA
There are even comet sighting opportunities in April.
On April 3, the comet should be in the same part of the sky as the Andromeda Galaxy. Although the comet won't still be visible with the naked eye, stargazers with telescopes could still get a nice view of the comet and galaxy, Gaherty explained.
Pan-STARRS has already put on a show for stargazers in the Southern Hemisphere. It is one of several comets in the night sky expected to dazzle observers this year. Last month, amateur astronomers managed to photograph Pan-STARRS and another celestial wanderer — Comet Lemmon — at the same time to documentrare photos of two comets together in the night sky.
Later this year, another comet from the Oort Cloud could be the brightest comet to pass by the Earth in a generation. Comet ISON is expected to outshine every comet in recent memory when it makes its closest swing by the sun late November.
Editor's note: If you snap an amazing photo of Comet Pan-STARRS in the night sky, or any other celestial object, and you'd like to share for a possible story or image gallery, please send images and comments, including location information, to managing editor Tariq Malik at spacephotos@space.com.
Follow Miriam Kramer @mirikramer and Google+. Follow us @Spacedotcom, Facebook and Google+. Original article onSPACE.com.
Lamborghini LP 750-4 Veneno - Παγκόσμια Πρεμιέρα price 3.000.000
In the year of its 50th anniversary Automobili Lamborghini is presenting an extremely exclusive model at the Geneva Motor Show 2013. Only three unique units of the Lamborghini Veneno will be built and sold. Its design is consistently focused on optimum aerodynamics and cornering stability, giving the Veneno the real dynamic experience of a racing prototype, yet it is fully homologated for the road. With a maximum output of 552 kW / 750 hp, the Veneno accelerates from 0 to 100 km/h in just 2.8 seconds and the top speed for this street-legal racing car stands at 355 km/h. It is priced at three million Euros plus tax -- and all three units have already been sold to customers.
The Lamborghini Veneno features a twelve-cylinder power unit with a displacement of 6.5 liters, an extremely fast-shifting 7-speed ISR transmission with 5 driving modes and permanent all-wheel drive, as well as a racing chassis with pushrod suspension and horizontal spring/damper units. Above all, however, the Veneno benefits from the very special expertise that Automobili Lamborghini possesses in the development and execution of carbon-fiber materials -- the complete chassis is produced as a CFRP monocoque, as is the outer skin of this extreme sports car. The inside, too, features innovative, Lamborghini-patented materials such as Forged Composite and CarbonSkin.
Fully in keeping with the tradition of the brand, the name of the Veneno originates from a legendary fighting bull. Veneno is the name of one of the strongest and most aggressive fighting bulls ever. He is also famous for being one of the fastest bulls in the history of bullfighting. His name became popular in 1914, when he fatally wounded the famous torero José Sánchez Rodríguez during the bullfight in the arena Sanlúcar de Barrameda's, Andalusia, Spain.
The Lamborghini Veneno features a twelve-cylinder power unit with a displacement of 6.5 liters, an extremely fast-shifting 7-speed ISR transmission with 5 driving modes and permanent all-wheel drive, as well as a racing chassis with pushrod suspension and horizontal spring/damper units. Above all, however, the Veneno benefits from the very special expertise that Automobili Lamborghini possesses in the development and execution of carbon-fiber materials -- the complete chassis is produced as a CFRP monocoque, as is the outer skin of this extreme sports car. The inside, too, features innovative, Lamborghini-patented materials such as Forged Composite and CarbonSkin.
Fully in keeping with the tradition of the brand, the name of the Veneno originates from a legendary fighting bull. Veneno is the name of one of the strongest and most aggressive fighting bulls ever. He is also famous for being one of the fastest bulls in the history of bullfighting. His name became popular in 1914, when he fatally wounded the famous torero José Sánchez Rodríguez during the bullfight in the arena Sanlúcar de Barrameda's, Andalusia, Spain.
Παρασκευή 8 Μαρτίου 2013
Πέμπτη 7 Μαρτίου 2013
Μη επανδρωμένο αεροσκάφος κρούσης
Μη επανδρωμένο αεροσκάφος κρούσης: συνδυασμός των γνώσεων δυο σχεδιαστικών γραφείων
Οι ρωσικές εταιρίες Sukhoi και MiG, οι οποίες σήμερα υπάγονται στη δομή της Ενωμένης Αεροναυπηγικής Εταιρείας (United Aircraft Corporation – UAC), θα δημιουργήσουν ένα υπερσύγχρονο μη επανδρωμένο ιπτάμενο μέσο κρούσης για την Πολεμική Αεροπορία της Ρωσίας.
Αυτό ανακοίνωσε στους δημοσιογράφους ο Πρόεδρος της εταιρείας Μιχαήλ Πογκοσιάν. Η συνένωση του δυναμικού των δύο κορυφαίων γραφείων σχεδιασμού πρέπει να έχει ως αποτέλεσμα την ανάπτυξη ενός ανταγωνιστικού αεροσκάφους με υψηλά τεχνικά χαρακτηριστικά.
Στην αεροπορική έκθεση MAKS 2007 η εταιρεία MiG επέδειξε μια πλήρους μεγέθους μακέτα του μη επανδρωμένου αεροσκάφους κρούσης Scat, το οποίο προορίζεται για την αναγνώριση επίγειων στόχων και την προσβολή τους με όπλα ακριβείας.
Η συσκευή βάρους 10 τόνων, κατασκευασμένη βάσει του σχήματος «Ιπτάμενη πτέρυγα», μπορεί να καλύψει απόσταση μέχρι και 4 χιλ. χλμ. Το μέγιστο ύψος πτήσης είναι 12 χλμ. Όμως η ασταθής οικονομική κατάσταση και η έλλειψη στελεχών της MiG έχουν επιβραδύνει σημαντικά την περαιτέρω εργασία προώθησης του σχεδίου. Ακριβώς σ΄ αυτό το στάδιο άρχισαν οι δηλώσεις για την αναγκαιότητα δημιουργίας από κοινού τέτοιου είδους ιπτάμενου μέσου από τα σχεδιαστικά γραφεία Mikoyan και Sukhoi.
Προς το παρόν είναι άγνωστο ποια θα είναι η τελική μορφή του κοινού μη επανδρωμένου αεροσκάφους. Όμως η συμμετοχή στο πρόγραμμα της MiG και το υψηλό επίπεδο προεργασίας κατά την ανάπτυξη της αντίληψης του Scat παρέχουν βάσιμους λόγους να πιστεύουμε ότι το σχέδιο της MiG θα αποτελέσει τη βάση της ανάπτυξής του.
Μια τέτοια συσκευή μπορεί να καταστεί άκρως σημαντικό στοιχείο της μαχητικής ισχύος της Πολεμικής Αεροπορίας της Ρωσίας. Τα σχεδόν αόρατα μη επανδρωμένα αεροσκάφη κρούσης, που μπορούν να επιτίθενται σε στόχους αμέσως μόλις τους εντοπίσουν, μπορούν να αποδεχτούν επωφελή τόσο σε μικρές συγκρούσεις, όσο και σε μεγάλης κλίμακας πολεμικές επιχειρήσεις. Σήμερα τέτοια ιπτάμενα μέσα δημιουργούνται στις Ηνωμένες Πολιτείες και την Ευρωπαϊκή Ένωση. Η υστέρηση στην ανάπτυξη τέτοιων συσκευών μπορεί να έχει αρνητικές συνέπειες για την αμυντική ικανότητα της Ρωσίας.
Στη Ρωσία σήμερα προωθείται η ανάπτυξη αεροπλανοφόρου πολλαπλών στόχων. Οι εκπρόσωποι της Κεντρικής Διοίκησης του στόλου έχουν ήδη δηλώσει επανειλημμένα ότι στα καταστρώματα των υπό ανάπτυξη αεροπλανοφόρων πρέπει να σταθμεύουν και μη επανδρωμένα αεροσκάφη. Λαμβανομένων υπόψη των διαστάσεων του εν δυνάμει αεροσκάφους κρούσης, το οποίο μπορεί να δημιουργηθεί στα πλαίσια της αντίληψης του Scat, η πιθανότητα δημιουργίας έκδοσης καταστρώματος τέτοιου ιπτάμενου μέσου φαίνεται αρκετά υψηλή.
Ο επικεφαλής της Ενωμένης Αεροναυπηγικής Εταιρείας Μιχαήλ Πογκοσιάν δήλωσε ότι προς το παρόν το σχέδιο βρίσκεται στο στάδιο της έρευνας. Λαμβανομένης υπόψη της πείρας που έχει αποκτηθεί και της υφιστάμενης τεχνικής βάσης, μπορούμε να υποθέσουμε ότι αυτό το στάδιο θα διαρκέσει περίπου δύο χρόνια και στη συνέχεια να αρχίσει το πειραματικό και σχεδιαστικό έργο της ανάπτυξης. Λαμβάνοντας υπόψη το συνολικό δυναμικό των δύο κορυφαίων ρωσικών σχεδιαστικών γραφείων αεροναυπηγικής, μπορούμε να κάνουμε την πρόβλεψη ότι το ρωσικό μη επανδρωμένο αεροσκάφος κρούσης θα πραγματοποιήσει την πρώτη του πτήση το 2017 ή το 2018 και η σειριακή παραγωγή του μπορεί να αρχίσει πριν το τέλος αυτής της δεκαετίας.
Alexander McQueen Fall/Winter 2013-14 | Paris Fashion Week PFW | FashionTV
ΚΑΙ Η ΜΟΔΑ ΕΧΕΙ ΤΗΝ ΑΡΧΙΤΕΚΤΟΝΙΚΗ ΤΗΣ.
Τετάρτη 6 Μαρτίου 2013
Shocking amateur footage of police beating a woman with sticks in India
Δυστυχως η ινδια ειναι μια τριτοκοσμικη χωρα στα δικαιωματα των γυναικων.
Τωρα που λενε οτι εχει και πυρινικο οπλοστασιο, στα δικαιωματα των ανδρων δεν ξερω τι γινετε.
Τωρα που λενε οτι εχει και πυρινικο οπλοστασιο, στα δικαιωματα των ανδρων δεν ξερω τι γινετε.
Τρίτη 5 Μαρτίου 2013
Δευτέρα 4 Μαρτίου 2013
Did a Comet Really Chill and Kill Clovis Culture?
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 A 130-foot-meteor created the mile-wide Meteor Crater in Arizona. The comet proposed to have impacted life in North America was significantly larger, but no crater indicating its collision has been found.CREDIT: Dan Durda |
A comet crashing into the Earth some 13,000 years ago was thought to have spelled doom to a group of early North American people, and possibly the extinction of ice age beasts in the region.
But the space rock was wrongly accused, according to a group of 16 scientists in fields ranging from archaeology to crystallography to physics, who have offered counterevidence to the existence of such a collision.
"Despite more than four years of trying by many qualified researchers, no unambiguous evidence has been found [of such an event]," Mark Boslough, a physicist at Sandia National Laboratories in New Mexico, told LiveScience.
"That lack of evidence is therefore evidence of absence."
Changing times
Almost 13,000 years ago, a prehistoric Paleo-Indian group known as the Clovis culture suffered its demise at the same time the region underwent significant climate cooling known as the Younger Dryas. Animals such as ground sloths, camels and mammoths were wiped out in North America around the same period. [Wipe Out: The 10 Most Mysterious Extinctions]
In 2007, a team of scientists led by Richard Firestone of the Lawrence Berkeley National Laboratory in California suggested these changes were the result of a collision or explosion of an enormous comet or asteroid, pointing to a carbon-rich black layer at a number of sites across North America. The theory has remained controversial, with no sign of a crater that would have resulted from such an impact.
"If a four-kilometer [2.5-mile] comet had broken up over North America only 12.9 thousand years ago, it is certain that it would have left an unambiguous impact crater or craters, as well as unambiguous shocked materials," Boslough said.
Boslough, who has spent decades studying the effects of comet and asteroid collisions, was part of a team that predicted the visibility of plumes from the impact of the 1994 Shoemaker-Levy 9 comet with Jupiter.
"Comet impacts may be low enough in density not to leave craters," Firestone told LiveScience by email.
He also points to independent research by William Napier at the University of Cardiff in the United Kingdom that indicates such explosions could have come from a debris trail created by Comet Encke, which also would not have left a crater.
A large rock plunging into the Earth's atmosphere may detonate in the air without coming into contact with the ground. Such an explosion occurred in Siberia in the early 20th century; the explosive energy of the so-called Tunguska event was more than 1,000 times more powerful than the atomic bomb dropped on Hiroshima.
"No crater was formed at Tunguska, or the recent Russian impact," Firestone said.
But Boslough said this math doesn't add up. The object responsible for the Tunguska event was very small, about 130 to 160 feet (40 to 50 meters) wide, while the recent explosion over Russia was smaller, about 56 feet (17 meters). The proposed North American space rock linked with the Clovis demise is estimated to have been closer to 2.5 miles (4 kilometers) across.
"The physics doesn't support the idea of something that big exploding in the air," he said, noting that the original research team doesn't provide any explanation or models for how such a breakup might occur. [The 10 Greatest Explosions Ever]
If such a large object crashed into the Earth, the resulting crater would be too large to miss, particularly when it was only a few thousand years old, Boslough said. He pointed to Meteor Crater in Arizona, which is three times as old and formed by an object "a million times smaller in terms of explosive energy."
"Meteor Crater is an unambiguous impact crater with unambiguous shocked minerals," Boslough said. If a 2.5-mile comet had broken into pieces, it could have made a million Meteor Craters, he added.
Firestone argued that water or ice could have absorbed the impact, possibly leaving behind no crater.
Boslough disagreed. Even if the comet had plunged into the ice sheet covering much of North America, the crater formed beneath it would still be sizable. "We wouldn't be able to miss that right now — it would be obvious," Boslough said.
The arguments and evidence against the impact were published in the December 2012 American Geophysical Union monograph.
"Extraordinary claims require extraordinary evidence"
Powerful impacts are Boslough's field, but the other 15 scientists working on the paper offered up other sources of counterevidence for the existence of a collision.
"We all independently came to the conclusion that the evidence doesn't support a Younger Dryas impact," Boslough said. [Asteroid Basics: A Space Rock Quiz]
"We all came to this based on our own very narrow piece of the puzzle."
For instance, the initial team studying the event announced the discovery of a carbon-rich black layer, colloquially known as a "black mat," at a number of sites in North America. Containing charcoal, soot and nanodiamonds, such material could be formed by a violent collision.
But this isn't the only possible source.
"The things they call impact markers are not necessarily indicators of high-pressure shocks," Boslough said. "There are other processes that potentially could have formed them."
Speaking of the black mat found in central Mexico, Firestone said, "Boslough is correct that there are other black mats, but these are dated to 12,900 years ago at the time of impact." He points to independent research published this fall that located hundreds to thousands of samples.
However, radiocarbon dating of one of the sites in Gainey, Mich., suggested its samples were contaminated.
Melted rock formations and microscopic diamonds found in a lake in Central Mexico last year were also suggested as evidence for the collision, but Boslough's team disagrees with the age of the sediment layer in the region.
Boslough said the standard for indicating a strong shock occurred is pretty high in the impact community, and the findings by the original team don't meet them. Nor do they offer up any physical models that propose how an impact or airburst would have occurred — and the ones Boslough has run just don't pan out.
"It's really a stretch to claim that there was this large impact event with no crater and no unambiguous shock material, because large impacts are such rare events," Boslough said.
"When somebody is making a claim that something extraordinary happened, something out of the ordinary and with a very low probability, and they have ambiguous evidence, then the default is that it didn't happen," he continued.
"Extraordinary claims require extraordinary evidence."
Firestone stands firm.
"All the evidence has now been confirmed by others," he said.
"All the evidence has now been confirmed by others," he said.
"Boslough has no data supporting his arguments, and ignores the counter arguments of Bill Napier."
Σάββατο 2 Μαρτίου 2013
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