A Close-Up on Mysteries Made of Stone in Saudi Arabia’s Desert

A bull's eye and triangle formation at Samhah as it's seen from Google Earth. (The New York Times)
A bull's eye and triangle formation at Samhah as it's seen from Google Earth. (The New York Times)
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A Close-Up on Mysteries Made of Stone in Saudi Arabia’s Desert

A bull's eye and triangle formation at Samhah as it's seen from Google Earth. (The New York Times)
A bull's eye and triangle formation at Samhah as it's seen from Google Earth. (The New York Times)

Structures that may have been created by ancient tribes could only be studied using Google Earth. Saudi officials finally invited an archaeologist to observe them via helicopter.

For nearly a decade, Dr. David Kennedy marveled from behind his computer screen at thousands of mysterious stone structures scattered across Saudi Arabia’s desert. With Google Earth’s satellite imagery at his fingertips, the archaeologist peeked at burial sites and other so-called Works of the Old Men, created by nomadic tribes thousands of years ago.

But he was unable to secure permission to visit the country to observe up close the ancient designs that he and amateur archaeologists had studied from their desktops.

Last month, after announcing he had identified nearly 400 stone “gates,” Kennedy received the invitation of a lifetime from Saudi officials to investigate the hidden structures from a helicopter.

“They are absolutely astonishing,” said Kennedy, who recently retired from the University of Western Australia. “From 500 feet, you can see the vital details of structures that are invisible in the fuzzy image on Google Earth.”

Over the course of three days, he snapped more than 6,000 aerial photographs, lifting the veil on the ancient wonders.

Since 1997, Kennedy has studied similar structures in neighboring Jordan from the ground and sky. Many of the stone figures in both countries are in basalt fields known as harrats. The fields often feature dried up lava streams that twist and turn like slithering snakes across the dark landscape.

In Saudi Arabia, he explored 200 sites from the air across the regions of Harrat Khaybar and Harrat Uwayrid. The structures he observed ranged in shapes and sizes, which he describes as gates, kites, triangles, bull’s eyes and keyholes.

Of the 400 structures he describes as “gates” that he had identified on Google Earth, Kennedy studied about 40 from the helicopter and found that the structures were not randomly put together.

“We could see immediately they were much more complicated than they appeared on Google Earth,” Kennedy said. They were not simply heaps of stone.

Rather, each long bar was actually made up of two parallel lines of flat slabs placed on their edges facing each other with small stones filling the space in between.

“They are much more sophisticated than I was prepared for,” he said.

Some gates were larger than 1,000 feet long and 250 feet wide. He suspected the oldest may be about 9,000 years old. Though he is not sure of their purpose, he speculated they may have been used for farming purposes.

Kennedy also got a closer look at about a dozen of the “kites” that were first discovered in the Middle East by pilots in the 1920s. These are the most famous of the Works of the Old Men, and Kennedy has identified more than 900 of them in Saudi Arabia’s Harrat Khaybar.

From above, they typically resemble kites with strings and tails. They are often very large, with many stretching more than a quarter-mile. Archaeologists think gazelle were corralled into the head of the kite, where the hunters would come out to kill them. Sometimes multiple kites would overlap, so that if the animals got past one funnel they would get caught in another.

“Essentially there was no escape,” said Kennedy.

The ones in Saudi Arabia looked as if they were better built than the ones in Jordan, according to Kennedy.

The harrats were littered with the smaller structures he has named keyholes, wheels, triangles and bull’s-eyes.

Kennedy said he was surprised at how straight the lines of the triangles and keyholes were, as if the people who made them had picked out specific flat stones rather than random rocks.

Each triangle was isosceles and looked like it was pointing at something. Sometimes they were directed to a bull’s-eye that was about 15 feet or 150 feet away.

There were also several keyhole structures, sometimes lined up together. The heads of the keyholes were almost always near-perfect circles, and the walls were about three feet high.

These structures may have served some funerary or symbolic purpose. Kennedy did not date any of the structures he visited with radiocarbon testing, but he said that future groups should perform more thorough analysis.

“It’s absolutely vital that somebody follows up with serious groundwork,” he said.

Kennedy was invited by Amr AlMadani, the chief executive officer of the Royal Commission for Al-Ula Province, which was created to safeguard some of the country’s geological, historical and archaeological sites.

“Dr. Kennedy has spent many years poring over Google Earth images, and we were able to get him much closer to the sites,” said AlMadani, who joined Kennedy in the helicopter and described the experience as exciting.

“Thinking about how life was in the Arabian Peninsula and trying to imagine the way people hunted, lived and buried the dead was very much enriching,” he wrote in an email to the New York Times.

“Seeing it on Google images is one thing, but seeing it from a helicopter window from 300 feet is a totally different thing,” said Don Boyer, who accompanied Kennedy.

At the age of 70, Boyer is completing his doctorate in geo-archaeology and hydrology. “I think I was on a high the whole time. It was just remarkable. You run out of adjectives.”

Archaeologists not involved in the work called it a step forward in showing the rich and complicated prehistory of the Arabian Peninsula.

Huw Groucutt, an archaeologist at the University of Oxford, said the new images were very important, and that they can help show how human societies have modified the landscape.

“The challenge now is to conduct work on the ground,” he added.

Michael Petraglia, an archaeologist at the Max Planck Institute for the Science of Human History, agreed.

“What is so critical is to do ground survey and detailed excavation work. Otherwise, archaeological sites will often time seem mysterious and enigmatic,” he said in an email to the New York Times.

“Now the big and more difficult task is to document such structures on the ground to examine their function and to understand human life” in the region over time, he added.

The New York Times



How a New Planetarium Show Helped Scientists Unlock a Cosmic Secret 

The Milky Way as seen from Bali. (AFP/Getty Images) 
The Milky Way as seen from Bali. (AFP/Getty Images) 
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How a New Planetarium Show Helped Scientists Unlock a Cosmic Secret 

The Milky Way as seen from Bali. (AFP/Getty Images) 
The Milky Way as seen from Bali. (AFP/Getty Images) 

Scientists have unlocked one of the solar system's many secrets from an unexpected source: a planetarium show opening to the public on Monday.

At the American Museum of Natural History last fall, experts were hard at work preparing "Encounters in the Milky Way," a deep dive into our home galaxy shaped by the movements of stars and other celestial objects.

They were fine-tuning a scene featuring what's known as the Oort Cloud, a region far beyond Pluto filled with icy relics from the solar system's formation. Comets can hurtle toward Earth from the cloud, but scientists have never glimpsed its true shape.

One evening while watching the Oort Cloud scene, scientists noticed something strange projected onto the planetarium's dome.

"Why is there a spiral there?" said the museum's Jackie Faherty.

The inner section of the Oort Cloud, made of billions of comets, resembled a bar with two waving arms, similar to the shape of our Milky Way galaxy.

Scientists had long thought the Oort Cloud was shaped like a sphere or flattened shell, warped by the push and pull of other planets and the Milky Way itself. The planetarium show hinted that a more complex shape could lie inside.

The museum contacted the researcher who provided the Oort Cloud data for the show, who was also surprised to see the spiral.

"It's kind of a freak accident that it actually happened," said David Nesvorny with the Southwest Research Institute.

Realizing they'd stumbled on something new, the researchers published their findings earlier this year in The Astrophysical Journal.

The spiral is "a striking shift in our understanding of the outer solar system," planetary scientist Andre Izidoro with Rice University, who was not involved with the study, said in an email.

The discovery, relying on data on how celestial objects move and using simulations, will be difficult to confirm with observations. But knowing more about the orbits of distant comets could give scientists some clues, Izidoro said.

While putting together the planetarium show, the museum's experts weren't expecting a window into the universe's inner workings. The show, narrated by actor Pedro Pascal, features many vivid scenes that may capture audiences more than the Oort Cloud, said the museum's Jon Parker, including an ongoing merge of the Sagittarius mini galaxy with the Milky Way.

No matter how striking and beautiful the visuals of the show, the museum was committed to making it scientifically accurate. That's what created the perfect conditions to stumble upon something new, said the museum's Carter Emmart.

"You just never know what you're going to find," Emmart said.