Showing posts with label Plaentology. Show all posts
Showing posts with label Plaentology. Show all posts

Experts stumped by ancient Jerusalem markings


Experts stumped by ancient Jerusalem markings — Mysterious stone carvings made thousands of years ago and recently uncovered in an excavation underneath Jerusalem have archaeologists stumped.

Israeli diggers who uncovered a complex of rooms carved into the bedrock in the oldest section of the city recently found the markings: Three "V'' shapes cut next to each other into the limestone floor of one of the rooms, about 2 inches (5 centimeters) deep and 20 inches (50 centimeters) long. There were no finds to offer any clues pointing to the identity of who made them or what purpose they served.

The archaeologists in charge of the dig know so little that they have been unable even to posit a theory about their nature, said Eli Shukron, one of the two directors of the dig.

"The markings are very strange, and very intriguing. I've never seen anything like them," Shukron said.


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In this photo taken on Dec. 1, 2011, Israel's Antiquities Authority archeologist Eli Shukron sweeps marks carved in the bedrock in an archeological excavation in the city of David near Jerusalem's Old City. The mysterious stone carvings made thousands of years ago and recently uncovered in an excavation underneath Jerusalem have archaeologists stumped. (AP Photo/Sebastian Scheiner)


The shapes were found in a dig known as the City of David, a politically sensitive excavation conducted by Israeli government archaeologists and funded by a nationalist Jewish group under the Palestinian neighborhood of Silwan in east Jerusalem. The rooms were unearthed as part of the excavation of fortifications around the ancient city's only natural water source, the Gihon spring.

It is possible, the dig's archaeologists say, that when the markings were made at least 2,800 years ago the shapes might have accommodated some kind of wooden structure that stood inside them, or they might have served some other purpose on their own. They might have had a ritual function or one that was entirely mundane. Archaeologists faced by a curious artifact can usually at least venture a guess about its nature, but in this case no one, including outside experts consulted by Shukron and the dig's co-director, archaeologists with decades of experience between them, has any idea.

There appears to be at least one other ancient marking of the same type at the site. A century-old map of an expedition led by the British explorer Montague Parker, who searched for the lost treasures of the Jewish Temple in Jerusalem between 1909 and 1911, includes the shape of a "V'' drawn in an underground channel not far away. Modern archaeologists haven't excavated that area yet.

Ceramic shards found in the rooms indicate they were last used around 800 B.C., with Jerusalem under the rule of Judean kings, the dig's archaeologists say. At around that time, the rooms appear to have been filled with rubble to support the construction of a defensive wall.

It is unclear, however, whether they were built in the time of those kings or centuries earlier by the Canaanite residents who predated them.

The purpose of the complex is part of the riddle. The straight lines of its walls and level floors are evidence of careful engineering, and it was located close to the most important site in the city, the spring, suggesting it might have had an important function.

A unique find in a room beside the one with the markings — a stone like a modern grave marker, which was left upright when the room was filled in — might offer a clue. Such stones were used in the ancient Middle East as a focal point for ritual or a memorial for dead ancestors, the archaeologists say, and it is likely a remnant of the pagan religions which the city's Israelite prophets tried to eradicate. It is the first such stone to be found intact in Jerusalem excavations.

But the ritual stone does not necessarily mean the whole complex was a temple. It might simply have marked a corner devoted to religious practice in a building whose purpose was commonplace.

With the experts unable to come up with a theory about the markings, the City of David dig posted a photo on its Facebook page and solicited suggestions. The results ranged from the thought-provoking — "a system for wood panels that held some other item," or molds into which molten metal would could have been poured — to the fanciful: ancient Hebrew or Egyptian characters, or a "symbol for water, particularly as it was near a spring."

The City of David dig, where the carvings were found, is the most high-profile and politically contentious excavation in the Holy Land. Named for the biblical monarch thought to have ruled from the spot 3,000 years ago, the dig is located in what today is east Jerusalem, which was captured by Israel in 1967. Palestinians claim that part of the city as the capital of a future state.

The dig is funded by Elad, an organization affiliated with the Israeli settlement movement. The group also moves Jewish families into the neighborhood and elsewhere in east Jerusalem in an attempt to render impossible any division of the city in a future peace deal.

Palestinians and some Israeli archaeologists have criticized the dig for what they say is an excessive focus on Jewish remains. The dig's archaeologists, who work under the auspices of the government's Israel Antiquities Authority, deny that charge. ( Associated Press )

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New telescopes peer back to birth of first stars


New telescopes peer back to birth of first stars - A new network of telescopes will allow astronomers to peer deeper into space than ever before, enabling them to see the first stars and galaxies in the universe being born.

Using a new type of telescope, which detects low-frequency radio signals coming from outer space, scientists claim they will be able to see deeper into space, and so view events that occurred further into the universe's past due to the time it takes for the radio waves to reach Earth, than has previously been possible.

A network of 77 of these new telescopes is being built across Europe and will be combined with two other radio telescopes in the southern hemisphere to give an unprecedented view of the heavens.


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This image show the immense Andromeda galaxy


Astronomers hope to find clues that will help them unravel how the first stars and galaxies formed from the cloud of cool gas that made up the universe after the Big Bang.

The telescopes will also allow astronomers to sweep large sections of the sky in single nights and so increase the chances of spotting previously unseen objects in space.

Professor Rob Fender, an astronomer at the University of Southampton who is leading the project, said: "Detecting low-frequency radio waves means we can look deeper into space than has ever been possible before and means will be able to conduct the first studies of a time known as the epoch of re-ionisation.

"This was when the universe moved out of its so-called dark ages in the first billion years after the Big Bang and the first stars and galaxies began to form.

"By looking this far back we can hopefully find out more about what caused this to happen and what these early parts of the universe looked like.

"Low-frequency radio waves allow us to see through the inter-stellar gas that obscures much of the most distant parts of the universe, so we will be able to detect the most distant galaxies."

According to the present theories about the early universe, the Big Bang created a soup of primordial matter that gradually cooled over a million of years, leaving the universe dark and cold.

After several hundred million years, the first atoms began to form and gave birth to the first stars and black holes. The light from these created energy that resulted in a chain reaction of creation through the universe.

Radio waves are created by large, violent events in space such as exploding stars and black holes, which fling out huge amounts of energy.

By looking for this energy from deep in space, astronomers hope they will be able to see some of the first stars and galaxies being formed.

Radio telescopes are already used to detect high-frequency radio waves that come from space and enabled the discovery of pulsars and quasars.

Low-frequency radio waves, however, can travel much further through space than those currently detected by the array of radio dishes used by astronomers, so the new network of detectors, called Lofar (or low-frequency array) will allow astronomers to see some of the most distant objects in the universe.

Construction on the first Lofar telescope in the UK has just been completed in Chilbolton, Oxfordshire, while there are plans to build another four in Edinburgh, Cambridge, and at Jodrell Bank outside Manchester.

There are another 48 already built or near-completion elsewhere in Europe.

The low-frequency telescopes consist of a series aerials set up in fields across Europe, with the first having being built in the Netherlands.

Computer software helps to filter out background radio signals from televisions and terrestrial radio broadcasts while also allowing astronomers to focus the telescopes onto areas of the sky.

When complete, data from 15,000 aerials across Europe, including from the UK, Italy, France, Germany and Sweden, will then be fed to a central hub in the northern Netherlands before being analysed by astrophyscists.

Another radio telescope being built in the Northern Cape of South Africa, called MeerKat, will also allow the astronomers to monitor the sky in the southern hemisphere along with a further radio telescope called Aakap in Western Australia.

These two telescopes will operate at higher frequencies and provide astronomers the option of looking in more detail at objects found using Lofar.

Professor Fender, who has received £3 million of funding from the European Research Council to co-ordinate the collaborative project, which has been named 4Pi Sky, said: "Low-frequency radio surveys also allow us to cover large amounts of the sky at any one time.

"Rather than taking months to sweep the whole sky, we will be able to do it in a matter of days.

"As we will be looking in frequencies that have not been explored before, there is also the chance we will make some unexpected discoveries. This has happened in the past when people started using X-ray and microwave detectors."

Dr Robert Massey, from the Royal Astronomical Society, said: "This is a fantastic example of a project where international collaboration is needed to see truly distant objects far more sharply than could have been possible before.

"It should help answer some very important questions about what happened after the Big Bang to result in the stars and galaxies we have around us today."

Lord Martin Rees, the astronomer Royal and a professor of cosmology at the University of Cambridge, added: "Lofar is the first of these next generation telescopes and a pre-cursor to the Square Kilometre Array, which will spread have a huge collecting area.

"Telescopes like this can help to produce a three-dimensional map of the ionised and unionised hydrogen in the universe, which is a rich source of information about what happened during these early stages of the universe when the cosmic dark ages ended and the first stars formed to light the universe up again." ( telegraph.co.uk )


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Oldest T Rex relative discovered in London


Dinosaur dynasty: Oldest T Rex relative discovered in London. Remains of the oldest-known relative of the Tyrannosaurus Rex have been discovered, more than 100 years after being pulled out of a Gloucestershire reservoir.

The near-complete 11inch skull has been identified as a 165-million-year-old ancestor of the fearsome dinoaur, called Proceratosaurus.

It was unearthed in the vast collection of London's Natural History Museum, according to research published in the Zoological Journal of the Linnean Society today.

skull

The fossil skull of Proceratosaurus the oldest-known relative of T.rex, which lived 165 million years ago

Proceratosaurus was probably only around 9ft long and lived 100 million years earlier that the 40ft long T- Rex. This gives scientists important clues about the early stages of the evolution of these fearsome predators.

A team of British and German scientists used computed tomography (CT) techniques to generate X-rays and then a 3D image of the delicate skull remains. This meant they could study its internal structure in minute detail.

They found that its teeth, jaws and braincase all closely resemble the structures found in the gigantic predator.

‘It was quite a surprise when our analysis showed we had the oldest known relative of T.rex,’ said Museum dinosaur expert, Dr Angela Milner.

‘We care for over nine million fossils here at the Museum and this discovery highlights the importance of museum collections in current and future research. Fossils collected a century ago can now be studied again with the benefit of much greater knowledge of dinosaurs from around the world.’

t rex

Tyrannosaurus rex grew up to 40ft long, while its ancestor grew to 9ft

‘This is a very fragile skull,’ says Museum fossil expert, Scott More-Fay, ‘so removing the rock, especially from around the teeth, was a delicate and time-consuming task that had to be done under a microscope, using very fine tools.’

The skull was uncovered during excavations for a reservoir close to Minchinhampton in Gloucestershire. In 1910, it was described as a new species of Megalosaurus.

The fossil was presented to the Natural History Museum in 1922 by F L Bradley, but its links to the most famous dinosaur family of all remained undiscovered until now.

Tyrannosaurus rex lived around 67 to 65 million years ago at the end of the dinosaur era in the Cretaceous period, and is a member of a larger group, called Tyrannosauroidea, after its most famous member.

Dr Oliver Rauhut from the Bavarian State Collection for Palaeontology and Geology in Munich said: ‘This is still one of the best-preserved dinosaur skulls found in Europe. It is really surprising that it has received so little attention since its original description.’

And, there are many possibilities to discover and identify new species using techniques such as CT modelling, as Dr Rauhut explains: ‘I’m sure that many more tyrannosaurs are still out there to be found. I think we have just scratched the tip of the iceberg so far.’ dailymail



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