Keyword: poleshift

Brevity: Headers | « Text »
  • A Diamond the Size of Earth - is this Jupiter's core?

    12/28/2018 10:47:49 AM PST · by Red Badger · 57 replies
    www.guide-to-the-universe.com ^ | 12/28/2018 - Undated | Staff
    In his book "2061 - Odyssey Three" (the third of his Space Odyssey series), Arthur C. Clarke put forward the intriguing proposal that the core of the planet Jupiter was, in fact, a diamond the size of Earth. Now Clarke, even though a science fiction author of some repute, had a science background and always tried to bring rigorous scientific accuracy to his stories. So, could his proposition be possible? The somewhat predictable answer is - we don't know. But we can analyse the possibility within known scientific parametres, to see if it is, at least, possible. For diamond to...
  • Juno Finds that Jupiter’s Gravitational Field is “Askew”

    10/27/2017 7:55:03 AM PDT · by BenLurkin · 29 replies
    Jupiter’s gravity field varies with depth, which indicated that material is flowing as far down as 3,000 km (1,864 mi). Combined with information obtained during previous perijoves, this latest data suggests that Jupiter’s core is small and poorly defined. This flies in the face of previous models of Jupiter, which held that the outer layers are gaseous while the interior ones are made up of metallic hydrogen and a rocky core. ... Another interesting find was that Jupiter’s gravity field varies with depth, which indicated that material is flowing as far down as 3,000 km (1,864 mi). Combined with information...
  • A Whole New Jupiter: First Science Results from NASA’s Juno Mission

    05/25/2017 5:04:05 PM PDT · by BenLurkin · 16 replies
    nasa ^ | May 25, 2017 | Dwayne Brown / Laurie Cantillo
    Early science results from NASA’s Juno mission to Jupiter portray the largest planet in our solar system as a complex, gigantic, turbulent world, with Earth-sized polar cyclones, plunging storm systems that travel deep into the heart of the gas giant, and a mammoth, lumpy magnetic field that may indicate it was generated closer to the planet’s surface than previously thought. “We are excited to share these early discoveries, which help us better understand what makes Jupiter so fascinating,” said Diane Brown, Juno program executive at NASA Headquarters in Washington. "It was a long trip to get to Jupiter, but these...
  • Rise of dinosaurs linked to increasing oxygen levels

    08/22/2019 6:45:52 PM PDT · by SunkenCiv · 37 replies
    EurekAlert! ^ | Tuesday, August 20, 2019 | Goldschmidt Conference
    Scientists have found that increasing oxygen levels are linked to the rise of North American dinosaurs around 215 M years ago. A new technique for measuring oxygen levels in ancient rocks shows that oxygen levels in North American rocks leapt by nearly a third in just a couple of million years, possibly setting the scene for a dinosaur expansion into the tropics of North America and elsewhere... The US-based scientists have developed a new technique for releasing tiny amounts of gas trapped inside ancient carbonate minerals. The gases are then channelled directly into a mass spectrometer, which measures their composition....
  • Most Recent Reversal of Earth’s Magnetic Field Lasted 22,000 Years

    08/08/2019 2:00:05 PM PDT · by BenLurkin · 20 replies
    sci-news.com ^ | 08/08/2019
    The researchers combined magnetic readings and radioisotope dating of samples from seven lava flow sequences to recreate the magnetic field over a span of about 70,000 years centered on the latest geomagnetic reversal. They accurately dated the lava flows by measuring the argon produced from radioactive decay of potassium in the rocks. They found that the final reversal was quick by geological standards, less than 4,000 years. But it was preceded by an extended period of instability that included two excursions — temporary, partial reversals — stretching back another 18,000 years. The lava flow data was corroborated by magnetic readings...
  • Ancient Tree With Record of Earth's Magnetic Field Reversal in Its Rings Discovered

    07/15/2019 9:21:19 AM PDT · by SunkenCiv · 93 replies
    Newsweak ^ | Thursday, July 4, 2019 | Hannah Osborne
    An ancient tree that contains a record of a reversal of Earth's magnetic field has been discovered in New Zealand. The tree -- an Agathis australis, better known as its M&Ccedilori name kauri -- was found in Ngawha, on New Zealand's North Island, during excavation work for the expansion of a geothermal power plant, stuff.nz reports. The tree, which had been buried in 26 feet of soil, measures eight feet in diameter and 65 feet in length. Carbon dating revealed it lived for 1,500 years, between 41,000 and 42,500 years ago... The lifespan of the kauri tree covers a point...
  • Earth's Core, Magnetic Field Changing Fast, Study Says

    07/10/2008 1:53:24 PM PDT · by hripka · 138 replies · 298+ views
    National Geographic Society ^ | June 30, 2008 | Kimberly Johnson
    Rapid changes in the churning movement of Earth's liquid outer core are weakening the magnetic field in some regions of the planet's surface, a new study says. "What is so surprising is that rapid, almost sudden, changes take place in the Earth's magnetic field," said study co-author Nils Olsen, a geophysicist at the Danish National Space Center in Copenhagen. The findings suggest similarly quick changes are simultaneously occurring in the liquid metal, 1,900 miles (3,000 kilometers) below the surface, he said. The swirling flow of molten iron and nickel around Earth's solid center triggers an electrical current, which generates the...
  • People can sense Earth’s magnetic field, brain waves suggest

    03/18/2019 1:26:25 PM PDT · by DUMBGRUNT · 71 replies
    Science News ^ | 18 Mar 2019 | MARIA TEMMING
    During the experiment, 26 participants each sat with their eyes closed in a dark, quiet chamber lined with electrical coils. These coils manipulated the magnetic field inside the chamber such that it remained the same strength as Earth’s natural field but could be pointed in any direction. Participants wore an EEG cap that recorded the electrical activity of their brains while the surrounding magnetic field rotated in various directions. ...Joseph Kirschvink, a neurobiologist and geophysicist at Caltech, and colleagues studied alpha waves to determine whether the brain reacts to changes in magnetic field direction. Alpha waves generally dominate EEG readings...
  • Check your compass: The magnetic north pole is on the move

    02/05/2019 11:32:20 AM PST · by Puppage · 55 replies
    AP ^ | 02/05/2019 | AP
    WASHINGTON (AP) - North isn't quite where it used to be. Earth's north magnetic pole has been drifting so fast in the last few decades that scientists say that past estimates are no longer accurate enough for precise navigation. On Monday, they released an update of where magnetic north really was, nearly a year ahead of schedule.
  • Earth’s Magnetic Field Decaying at an Alarming Rate

    12/11/2018 11:21:44 AM PST · by fishtank · 151 replies
    Creation Evolution Headlines ^ | 12-11-18 | David F. Coppedge
    Earth’s Magnetic Field Decaying at an Alarming Rate December 11, 2018 | David F. Coppedge The biosphere depends on earth’s magnetic field, but it has been decaying rapidly for at least 1500 years. In Spacecraft Earth: A Guide for Passengers, Dr Henry Richter describes how the story of the decay of the earth’s magnetic field caught his attention. He had read the monograph by Dr Thomas Barnes in the 1970s, and realized the implications: if the decay is true, the earth could not be billions of years old. He considered the various proposals for maintaining the field, but none of...
  • "Earth's Magnetic Field not flipping tonight, perhaps.." John Batchelor Show

    05/02/2018 6:45:59 AM PDT · by Voption · 4 replies
    The John Batchelor Show WABC- NY ^ | May 2, 2018 | John Batchelor/Robert Zimmerman
    Blue Origin test flight, China's space-program, SLS, earth's magnetic field flipping?
  • Why Earth's Magnetic Field Might Not Flip After All

    05/01/2018 8:06:25 AM PDT · by BenLurkin · 55 replies
    Live Science ^ | April 30, 2018 03:35pm ET | Stephanie Pappas,
    In a study published in the journal Proceedings of the National Academy of Sciences today (April 30), researchers ... found that today's patterns don't resemble the two most extreme disruptions in the past 50,000 years, when the magnetic field nearly reversed. [7 Ways the Earth Changes in the Blink of an Eye] Instead, the modern field appears similar to the field during two other periods — one 49,000 ago, and one 46,000 years ago — when the field wobbled but didn't flip-flop. ... Currently, magnetic north is very close to the North Pole, while magnetic south is near the South...
  • Earth Raised Magnetic Shield Earlier than Thought

    03/07/2010 7:44:00 PM PST · by SunkenCiv · 22 replies · 168+ views
    Discovery News ^ | Thursday, March 4, 2010 | Irene Klotz
    Young Earth was cocooned in a protective shield that magnetically deflected killer solar radiation 200 million years earlier than previously thought, a key factor that allowed life to take hold, according to a new study published this week in the journal Science. The research, based on analysis of ancient silicate crystals from South Africa, has implications for the search for life beyond Earth, which to date has focused on finding planets where liquid water can exist. The study by University of Rochester geophysicist John Tarduno and colleagues suggests that the ability of a planet to generate a large magnetic field...
  • Earth's Magnetic Field Weakens 10 Percent (and some other stuff)

    12/12/2003 6:26:01 PM PST · by NormsRevenge · 20 replies · 588+ views
    Yahoo News ^ | 12/12/03 | Andrew Bridges - AP
    SAN FRANCISCO - The strength of the Earth's magnetic field has decreased 10 percent over the past 150 years, raising the remote possibility that it may collapse and later reverse, flipping the planet's poles for the first time in nearly a million years, scientists said Thursday.   At that rate of decline, the field could vanish altogether in 1,500 to 2,000 years, said Jeremy Bloxham of Harvard University. Hundreds of years could pass before a flip-flopped field returned to where it was 780,000 years ago. But scientists at a meeting of the American Geophysical Union cautioned that scenario is an...
  • Textbook Case of Tectonic Movement is Wrong, Says New Study

    08/22/2003 6:43:59 AM PDT · by forsnax5 · 14 replies · 6+ views
    University of Rochester ^ | August 22, 2003 | John Tarduno, Rory Cottrell
    Textbook Case of Tectonic Movement is Wrong, Says New Study Results from an expedition to the sea floor near the Hawaiian Islands show evidence that the deep Earth is more unsettled than geologists have long believed. A new University of Rochester study suggests that the long chain of islands and seamounts, which is deemed a "textbook" example of tectonic plate motion, was formed in part by a moving plume of magma, upsetting the prevailing theory that plumes have been unmoving fixtures in Earth's history. The research will be published in the August 22 issue of Science. "Mobile magma plumes force...
  • NASA: Earth's Last Full Magnetic-Pole Reversal Occurred 780,000 Years Ago --"We Are Over Due"

    02/01/2017 9:05:34 PM PST · by MtnClimber · 53 replies
    The Daily Galaxy ^ | 1 Feb, 2016
    The Earth’s continuously changing magnetic field surrounds the planet like an invisible force field – deflecting highly charged solar particles. Reversals are the rule, not the exception. Earth has settled in the last 20 million years into a pattern of a pole reversal about every 200,000 to 300,000 years, although it has been more than twice that long since the last reversal, the Brunhes-Matuyama, that occurred around 780,000 years ago. A temporary reversal, the Laschamp event, occurred around 41,000 years ago, and lasted less than 1,000 years with the actual change of polarity lasting around 250 years. Our planet’s history...
  • Earth’s magnetic poles are set to swap places - and we're totally unprepared [Isaiah 24]

    01/30/2017 2:41:35 PM PST · by Jan_Sobieski · 89 replies
    Science Alert ^ | 01/30/2017 | PHIL LIVERMORE & JON MOUND
    Earth’s magnetic field surrounds our planet like an invisible force field - protecting life from harmful solar radiation by deflecting charged particles away. Far from being constant, this field is continuously changing. Indeed, our planet's history includes at least several hundred global magnetic reversals, where north and south magnetic poles swap places. So when’s the next one happening and how will it affect life on Earth? During a reversal the magnetic field won’t be zero, but will assume a weaker and more complex form. It may fall to 10 percent of the present-day strength and have magnetic poles at the...
  • Earth’s Magnetic Field is Changing

    12/23/2016 10:21:45 AM PST · by tired&retired · 61 replies
    Spaceweather.com ^ | May 16, 2016 | Dr. Tony Phillips
    Anyone watching a compass needle point steadily north might suppose that Earth’s magnetic field is a constant. It’s not. Researchers have long known that changes are afoot. The north magnetic pole routinely moves, as much as 40 km/yr, causing compass needles to drift over time. Moreover, the global magnetic field has weakened 10% since the 19th century. Earth’s magnetic field protects us from solar storms and cosmic rays. Less magnetism means more radiation can penetrate our planet’s atmosphere. Indeed, high altitude balloons launched by Spaceweather.com routinely detect increasing levels of cosmic rays over California. Perhaps the ebbing magnetic field over...
  • Earth's Magnetic Shield Is Much Older Than Thought

    07/31/2015 9:55:30 AM PDT · by JimSEA · 21 replies
    Science Daily ^ | 07/30/2015 | J. A. Tarduno, R. D. Cottrell, W. J. Davis, F. Nimmo, R. K. Bono.
    Since 2010, the best estimate of the age of Earth's magnetic field has been 3.45 billion years. But now a researcher responsible for that finding has new data showing the magnetic field is far older. John Tarduno, a geophysicist at the University of Rochester and a leading expert on Earth's magnetic field, and his team of researchers say they believe the Earth's magnetic field is at least four billion years old.
  • NASA’s magnetic field mission looking for green energy (or a powerful new weapon perhaps?)

    03/16/2015 10:47:56 AM PDT · by LibWhacker · 14 replies
    STGIST ^ | 3/14/15 | Carlo Diokno
    NASA’s magnetic field mission looking for green energy In addition to learning more about the magnetic field of the Earth, and the ubiquitous but hard to understand “magnetic reconnection,” NASA’s new MMS mission is also looking for ways to harness the power of magnetism, and produce clean energy. NASA’s MMS mission will investigate magnetic reconnection.Findings from this mission could lead to production of green energy from magnetism.Magnetic reconnection is ubiquitous in the cosmos, but it’s still poorly understood. After years of intensive planning, with countless days of engineering works, data analysis, and more, the National Aeronautics and Space Administration on Thursday successfully launched the...