This is a podcast for the curious. Strap yourself in for genuine dialogues with people who think deeply & are ready lớn tackle the big questions, such as broadcaster Terry O"Reilly, fantasy tác giả Guy Gavriel Kay,and journalist Sally Armstrong.
Bạn đang xem: What on earth?
Join Ben Charland to peel back the headlines & ask, what are the forces, people & ideas that shape the human story today? From the Mafiato the Beaverton,women in politics to lớn women in leadership,history khổng lồ artificial intelligence, andentrepreneurship in the digital age khổng lồ the art of wheelchair fencing, just what on Earth is going on?
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Sep 18, 2020
Farzana Doctor"s new novel, Seven, juggles family, history,culture, và the incredible weight of those forces on women today.It"s a detective story and travel novel, và a powerful insightinto a woman struggling with sex, identity, her past, and her vastnetwork of relatives. But the overarching issue throughoutthe...
Sep 4, 2020
It"s been over two years since host Ben Charland kicked off thispodcast in a basement in Kingston, Ontario. After nearly 100fascinating conversations about everything from the mafia to lớn thewater supply, from science to philosophy, we"re revisiting some ofthe best moments.
Author, science broadcaster và previous...
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Aug 21, 2020
The one thing that doesn"t change about cities is the fact thatthey are constantly changing. Most people now live in cities,transforming them with their consumer behaviour, their culture,their ideas and their advocacy. Thành phố planners have to balance thenatural development of these vast social organisms with...
Aug 7, 2020
The coronavirus pandemic is altering our lives in ways we cannotyet comprehend, and in decades we will marvel at thistransformative time. COVID-19 is not just accelerating trends thatwere in place beforehand, but it is creating new realities. How areartists coping? How about our politics & ideologies?
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Jul 24, 2020
What makes a book interesting? Beautiful? Provocative?
Necessary? Is reading still the best way khổng lồ get a message acrossand tell a good story, & how is it changing in our worldtoday?
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Fest is one of Canada"s premiereliterary events, drawing headline international authors as well asbig crowds from...
Your weekly podcast for a world in flux.Globalization và climate change. The rise of social truyền thông media and the decline và fall of Blockbuster Video. AI and VR. Donald Trump và Flat Earthers. The world is changing so fast that we can"t get a grip on how we got here, let alone where we"re headed.Join Ben Charland as he peels back the headlines khổng lồ ask, what are the events, characters, forces và ideas that shape the human story today? Have things always been this nuts, or are they getting crazier by the day? Who were those barbarians that took down the Blockbuster Empire? Just what on Earth is going on?
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The rotation of Earth’s inner vi xử lý core may have paused và it could even go into reverse, new research suggests.
The Earth is formed of the crust, the mantle & the inner và outer cores. The solid inner chip core is situated about 3,200 miles below the Earth’s crust và is separated from the semi-solid mantle by the liquid outer core, which allows the inner bộ vi xử lý core to rotate at a different tốc độ from the rotation of the Earth itself.
With a radius of almost 2,200 miles, Earth’s vi xử lý core is about the kích thước of Mars. It consists mostly of iron và nickel, and contains about about one-third of Earth’s mass.
In research published in the journal Nature Geoscience on Monday, Yi Yang, associate research scientist at Peking University, & Xiaodong Song, Peking University chair professor, studied seismic waves from earthquakes that have passed through the Earth’s inner chip core along similar paths since the 1960s to lớn infer how fast the inner vi xử lý core is spinning.
The "LLR" tia laze has been installed on the summit of the Säntis (2500m) và was activated from June to September 2021. It was focused above a 124m high transmitter tower belonging lớn the operator Swisscom, equipped with a traditional lightning conductor.
Martin Stollberg/TRUMPF
Car-size laser deflects lightning atop a mountain in Switzerland
What they found was unexpected, they said. Since 2009, seismic records, which previously changed over time, showed little difference. This, they said, suggested that the inner core rotation had paused.
“We show surprising observations that indicate the inner chip core has nearly ceased its rotation in the recent decade and may be experiencing a turning-back,” they wrote in the study.
“When you look at the decade between 1980 & 1990 you see clear change but when you see 2010 to lớn 2020 you don’t see much change,” added Song.
The spin of the inner vi xử lý core is driven by the magnetic field generated in the outer core & balanced by the gravitational effects of the mantle. Knowing how the inner chip core rotates could shed light on how these layers interact & other processes deep in the Earth.
However, the tốc độ of this rotation, và whether it varies, is debated, said Hrvoje Tkalcic, a geophysicist at the Australian National University, who was not involved in the study,
“The inner vi xử lý core doesn’t come lớn a full stop,” he said. The study’s finding, he said, “means that the inner core is now more in sync with the rest of the planet than a decade ago when it was spinning a bit faster.”
“Nothing cataclysmic is happening,” he added.
Based on new evidence from the NASA/ESA/CSA James Webb Space Telescope, this illustration reflects the conclusion that the exoplanet LHS 475 b is rocky và almost precisely the same kích thước as Earth. The planet whips around its star in just two days, far faster than any planet in the Solar System. Researchers will follow up this summer with additional observations with Webb, which they hope will allow them khổng lồ definitively conclude if the planet has an atmosphere. LHS 475 b is relatively close, 41 light-years away, in the constellation Octans.
NASA/ESA/CSA
tuy nhiên and Yang argue that, based on their calculations, a small imbalance in the electromagnetic and gravitational forces could slow và even reverse the inner core’s rotation. They believe this is part of a seven-decade cycle, & that the turning point prior lớn the one they detected in their data around 2009/2010 occurred in the early 1970s.
Tkalcic, who is the author of “The Earth’s Inner Core: Revealed by Observational Seismology,” said the study’s “data analysis is sound.” However, the study’s findings “should be taken cautiously” as “more data & innovative methods are needed khổng lồ shed light on this interesting problem.”
song and Yang agreed that more research was needed.
Studying the Earth’s core
Tkalcic, who dedicates an entire chapter of his book lớn the inner vi xử lý core rotation, suggested the inner core’s cycle is every đôi mươi to 30 years, rather than the 70 proposed in the latest study. He explained why such variations occur & why it was so difficult to understand what happens in the innermost reaches of the planet.
“The objects of our studies are buried thousands of kilometers beneath our feet,” he said.
“We use geophysical inference methods khổng lồ infer the Earth’s internal properties, & caution must be exercised until multi-disciplinary findings confirm our hypotheses và conceptual frameworks,” he explained
“You can think of seismologists like medical doctors who study the internal organs of patients’ bodies using imperfect or limited equipment. So, despite progress, our image of the inner Earth is still blurry, and we are still in the discovery stage.”
