Keyword: magneticfield

Brevity: Headers | « Text »
  • Earth's Inner Fort Knox [Earth's core has 1.6 quadrillion tons of gold]

    12/13/2006 10:58:55 PM PST · by grundle · 56 replies · 1,851+ views
    Discover magazine ^ | September 2006 | Anne Wootton
    Searching for a pot of gold? Try the center of the Earth. More than 99 percent of Earth's gold is missing—it all sank to the center of the planet billions of years ago. In fact, says geologist Bernard Wood of Macquarie University in Australia, there's enough gold in Earth's core to coat its surface in 1.5 feet of the stuff. How did it get there? Earth formed from a series of smaller planetesimals that crashed together over the course of 30 million to 40 million years. Wood deduced how much gold ought to be present in Earth's crust by comparing...
  • The Sun: A Great Ball of Iron?

    07/17/2002 11:33:32 PM PDT · by per loin · 66 replies · 680+ views
    Science Daily
    Source:   University Of Missouri-Rolla (http://www.umr.edu) Date:   Posted 7/17/2002 The Sun: A Great Ball Of Iron? For years, scientists have assumed that the sun is an enormous mass of hydrogen. But in a paper presented before the American Astronomical Society, Dr. Oliver Manuel, a professor of nuclear chemistry at UMR, says iron, not hydrogen, is the sun's most abundant element. Manuel claims that hydrogen fusion creates some of the sun's heat, as hydrogen -- the lightest of all elements -- moves to the sun's surface. But most of the heat comes from the core of an exploded supernova...
  • Primordial Nukes (Prehistoric Nukes Found)

    03/14/2005 5:37:24 PM PST · by blam · 17 replies · 1,548+ views
    Science News Magazine ^ | 3-14-2005 | Peter Weiss
    Primordial NukesThe 2-billion-year-old tale of Earth's natural nuclear reactors Peter Weiss For more than a decade, Alexander P. Meshik has kept close tabs on a fleck of black rock no larger than an infant's fingernail. It's so unassuming that most people would sweep it into a dustpan without a second thought. Yet to Meshik, a nuclear physicist originally from Russia, this little scrap of mineral is a scientific gem. E. Roell The fleck, with its clues to believe-it-or-not geophysical events, emerged from the bowels of Earth decades ago. It was unearthed in the early 1970s at the Oklo uranium mine...
  • Earth's magnetic field 'boosts gravity'

    09/23/2002 11:11:32 AM PDT · by VadeRetro · 134 replies · 1,680+ views
    New Scientist ^ | 09:20 22 September 02 | Michael Brooks
    Exclusive from New Scientist Hidden extra dimensions are causing measurements of the strength of gravity at different locations on Earth to be affected by the planet's magnetic field, French researchers say. This is a controversial claim because no one has ever provided experimental evidence to support either the existence of extra dimensions or any interaction between gravity and electromagnetism. But lab measurements of Newton's gravitational constant G suggest that both are real. Newton's constant, which describes the strength of the gravitational pull that bodies exert on each other, is the most poorly determined of the constants of nature. The two...
  • Earth Loses Magnetism

    01/01/2004 9:49:40 AM PST · by blam · 87 replies · 548+ views
    BBC ^ | 1-1-2004 | Molly Bently
    Earth loses its magnetism By Molly Bentley in San Francisco Scientists have known for some time that the Earth's magnetic field is fading. The field is mainly dipolar - but there are anomalies Like a Kryptonite-challenged Superman, its strength has steadily and mysteriously waned, leaving parts of the planet vulnerable to increased radiation from space. Some satellites already feel the effects. What is uncertain is whether the weakened field is on the way to a complete collapse and a reversal that would flip the North and South Poles. Compasses pointing North would then point South. It is not a matter...
  • Magnetic effects seen in water

    12/07/2004 2:12:48 PM PST · by rotstan · 13 replies · 724+ views
    Physics Web News ^ | 12/6/04 | Staff
    Physicists in Japan have discovered that the melting point of water increases slightly in a strong magnetic field. Hideaki Inaba and colleagues at Chiba University found that it increases by 5.6 millikelvin for ordinary water in a field of 6 Tesla, and by 21.8 millikelvin for heavy water (J. Appl. Phys. 96 6127). Water has many unusual properties: it has relatively high melting and boiling points for a small molecule, and the liquid state can also be denser than the solid state. These properties are thought to arise from the 3D network of hydrogen bonds in the molecule. Recently, it...
  • Magnetic Stars

    10/15/2004 8:29:46 AM PDT · by ckilmer · 8 replies · 525+ views
    eurekalert/Nature/Max-Planck-Gesellschaft ^ | October 14th, 2004 | J. Braithwaite and H.C. Spruit
    Magnetic Stars The puzzle of `magnetic stars' solved by astrophysicists of the Max Planck Society How does one explain the enormous magnetic field strengths of the so-called `magnetic stars'? This question concerning magnetic fields in the cosmos, first posed half a century ago, has now been answered by scientists of the Max Planck Institute for Astrophysics in Garching. With 3-dimensional numerical simulations they have found the magnetic field configurations that underly the strong magnetic fields observed on the surface of the so-called magnetic A-stars and magnetic White Dwarfs, and how these fields can survive for the life time of these...
  • Biggest stars produce strongest magnets

    01/30/2005 1:17:24 PM PST · by Willie Green · 14 replies · 1,000+ views
    SpaceFlightNow ^ | January 28, 2005 | HARVARD-SMITHSONIAN CENTER FOR ASTROPHYSICS
    For education and discussion only. Not for commercial use. Astronomy is a science of extremes - the biggest, the hottest, and the most massive. Today, astrophysicist Bryan Gaensler (Harvard-Smithsonian Center for Astrophysics) and colleagues announced that they have linked two of astronomy's extremes, showing that some of the biggest stars in the cosmos become the strongest magnets when they die. "The source of these very powerful magnetic objects has been a mystery since the first one was discovered in 1998. Now, we think we have solved that mystery," says Gaensler. The astronomers base their conclusions on data taken with CSIRO's...
  • Oceans charge up new theory of magnetism

    06/16/2009 9:29:47 AM PDT · by BGHater · 32 replies · 568+ views
    Times Online ^ | 14 June 2009 | Jonathan Leake
    A radical new idea may revolutionise our understanding of one of the most vital forces on Earth Earth's magnetic field, long thought to be generated by molten metals swirling around its core, may instead be produced by ocean currents, according to controversial new research published this week. It suggests that the movements of such volumes of salt water around the world have been seriously underestimated by scientists as a source of magnetism. If proven, the research would revolutionise geophysics, the study of the Earth’s physical properties and behaviour, in which the idea that magnetism originates in a molten core is...
  • Study Peels Back More of the Magnetic Sun

    03/12/2010 11:45:54 PM PST · by neverdem · 12 replies · 730+ views
    ScienceNOW ^ | March 12, 2010 | Phil Berardelli
    Enlarge Image Turmoil. Magnetism produces much of the sun's surface phenomena, such as these sunspots, seen in ultraviolet light. Credit: NASA/TRACE Researchers have discovered that one of the mysterious forces that sweep the sun's surface shows an unexpectedly strong connection with the number of sunspots, magnetic disturbances that can affect Earth's weather and telecommunications. The findings should improve predictions of the sun's dynamics and might even help scientists develop better climate models. Along with heat and light, the sun emits x-rays and magnetically charged particles that can endanger astronauts, fry circuits aboard satellites orbiting Earth, and overload electric power...
  • Earth's core rotating faster than rest of the planet but slower than previously believed

    02/21/2011 4:47:12 PM PST · by decimon · 29 replies
    University of Cambridge ^ | February 20, 2011 | Unknown
    New research gives the first accurate estimate of how much faster the Earth's core is rotating compared to the rest of the planet. Previous research had shown that the Earth's core rotates faster than the rest of the planet. However, scientists from the University of Cambridge have discovered that earlier estimates of 1 degree every year were inaccurate and that the core is actually moving much slower than previously believed – approximately 1 degree every million years. Their findings are published today, Sunday 20 February, in the journal Nature Geoscience. The inner core grows very slowly over time as material...
  • The Enigma 1,800 Miles Below Us

    05/30/2012 9:29:52 AM PDT · by JerseyanExile · 29 replies
    New York Times ^ | May 28, 2012 | Natalie Angier
    As if the inside story of our planet weren’t already the ultimate potboiler, a host of new findings has just turned the heat up past Stygian. Geologists have long known that Earth’s core, some 1,800 miles beneath our feet, is a dense, chemically doped ball of iron roughly the size of Mars and every bit as alien. It’s a place where pressures bear down with the weight of 3.5 million atmospheres, like 3.5 million skies falling at once on your head, and where temperatures reach 10,000 degrees Fahrenheit — as hot as the surface of the Sun. It’s a place...
  • Ain’t Misbehavin’ – Turbulence, Solar Flares and Magnetism

    05/22/2013 7:11:22 PM PDT · by BenLurkin · 9 replies
    UniverseToday ^ | May 22, 2013 | by Tammy Plotner on
    What’s more fun than something that misbehaves? When it comes to solar dynamics, we know a lot, but there are many things we don’t yet understand. For example, when a particle filled solar flare lashes out from the Sun, its magnetic field lines can do some pretty unexpected things – like split apart and then rapidly reconnect. According to the flux-freezing theorem, these magnetic lines should simply “flow away in lock-step” with the particles. They should stay intact, but they don’t. It’s not just a simple rule they break… it’s a law of physics.
  • ‘Will We Soon Find Ourselves Back In The Stone Age?’ Why Swarm Is Watching Our Magnetic Field

    11/25/2013 10:59:28 AM PST · by BenLurkin · 44 replies
    universetoday.com ^ | November 25, 2013 | Elizabeth Howell on
    The European Space Agency’s Swarm constellation flew into space on Friday (Nov. 22) on a quest to understand more about the Earth’s magnetic field. Around the same time, ESA put out a few videos explaining why the magnetic field is important. This one explains that the magnetic field has weakened over the past few years, while the north pole has shifted direction. “In fact, a whole pole reversal is possible,” the narrator says. “It happened last 780,000 years ago at the very beginning of human history. But cavemen didn’t have mobile phone networks, GPS networks or power supplies.” If a...
  • The sun's magnetic field is about to flip

    12/30/2013 9:48:19 AM PST · by Farnsworth · 44 replies
    Sun Herald ^ | December 30 2013 | NASA
    The sun is flipping its poles! Actually, NASA reports that this phenomenon happens about 11 years, when the sun's vast magnetic field flips. "It looks like we're no more than three to four months away from a complete field reversal," said solar physicist Todd Hoeksema of Stanford University. "This change will have ripple effects throughout the solar system." A video shows how the sun will complete the reversal, which appens at the peak of each solar cycle as the sun's inner magnetic dynamo re-organizes. The current "flip" is the midway point of Solar Cycle 24, NASA said. Hoeksema is the...
  • Ancient Mariners Reveal Tales From The Earth's Core

    05/12/2006 4:59:30 PM PDT · by blam · 23 replies · 874+ views
    Nature ^ | 5-11-2006 | Phillip Ball
    <p>Ship logs and pottery show how the geomagnetic field has changed.</p> <p>Old ship records of magnetic north have helped to unravel a record of our planet's field.</p> <p>While sailors plied the Seven Seas in the seventeenth and eighteenth centuries, little did they know that their ships' logs would one day help scientists to reconstruct the history of the Earth's magnetic field.</p>
  • Anomalies hint at magnetic pole flip

    04/10/2002 2:33:45 PM PDT · by aculeus · 129 replies · 1,261+ views
    New Scientist ^ | 10 April 02 | Nicola Jones
    The Earth's magnetic poles might be starting to flip say researchers who have seen strange anomalies in our planet's magnetic field. The magnetic field is created by the flow of molten iron inside the Earth's core. These circulation patterns are affected by the planet's rotation, so the field normally aligns with the Earth's axis - forming the north and south poles. But the way minerals are aligned in ancient rock shows that the planet's magnetic dipole occasionally disappears altogether, leaving a much more complicated field with many poles all over the planet. When the dipole comes back into force, the...
  • Astronomers find clues to decades-long coronal heating mystery [magnetic fields]

    10/19/2013 7:04:44 PM PDT · by SunkenCiv · 24 replies
    Astronomy ^ | Thursday, October 17, 2013 | Columbia University
    To understand the coronal heating problem, imagine a flame coming out of an ice cube. A similar effect occurs on the surface of the Sun. Nuclear fusion in the center of the Sun heats the solar core to 15 million degrees. Moving away from this furnace, by the time one arrives at the surface of the Sun, the gas has cooled to a relatively refreshing 10,800° Fahrenheit (6,000° Celsius). But the temperature of the gas in the corona, above the solar surface, soars back up to over 1.8 million degrees F (1 million degrees C). What causes this unexpected temperature...
  • A storm is coming: Sun's poles are set to FLIP...

    08/07/2013 3:04:47 PM PDT · by Hotlanta Mike · 46 replies
    Mail Online ^ | 6 August 2013 | Victoria Woollaston
    -The sun's magnetic field reverses its polarity once every 11 years or so -Flip represents a peak in solar activity where bursts of energy are released -These bursts can lead to space storms and changes to Earth's climate -Radio and satellite communications may also be affected
  • New device invisible to magnetic fields

    03/24/2012 11:19:51 PM PDT · by U-238 · 26 replies · 1+ views
    Defense Talk ^ | 3/24/2012 | Defense Talk
    European researchers said Thursday they have created a device invisible to a static magnetic field that could have practical military and medical applications. Fedor Gomory and colleagues in Slovakia and Spain designed a cloak for a direct current, or dc, magnetic field that is static and produced by a permanent magnet or coil carrying a direct current. DC magnetic fields are used in MRI imaging devices, in hospitals and in security systems, such as those in airports. The researchers' device, described in a study in Friday's edition of the journal Science, features a cylinder with two concentric layers. While the...
  • Magnetic Polar Shifts Causing Massive Global Superstorms

    02/04/2011 8:37:22 PM PST · by abbyg55 · 226 replies · 1+ views
    Salem-News.com ^ | 2-4-11 | Terrence Aym
    NASA has been warning about it…scientific papers have been written about it…geologists have seen its traces in rock strata and ice core samples... Now "it" is here: an unstoppable magnetic pole shift that has sped up and is causing life-threatening havoc with the world's weather. Forget about global warming—man-made or natural—what drives planetary weather patterns is the climate and what drives the climate is the sun's magnetosphere and its electromagnetic interaction with a planet's own magnetic field. When the field shifts, when it fluctuates, when it goes into flux and begins to become unstable anything can happen. And what normally...
  • Earth's Core Has Another Layer, Scientists Claim

    12/08/2010 12:01:06 PM PST · by NormsRevenge · 64 replies · 1+ views
    LiveScience.com ^ | 12/8/10 | Charles Q. Choi
    What may be a new outermost layer of the Earth's core has been found, geoscientists have revealed. This discovery could help solve mysteries of the planet's magnetic field, researchers say. The Earth's core is composed mainly of iron, divided into a solid inner center roughly 1,500 miles (2,440 kilometers) wide covered by a liquid outer layer about 1,400 miles (2,250 km) thick. Even though the bulk of the core is iron, researchers also knew it contained a small amount of lighter elements such as oxygen and sulfur. As the inner core crystallized over time, scientists think this process forced out...
  • Tiny 3-D images from Stanford and SLAC shed light on origin of Earth's core

    12/16/2010 12:58:12 PM PST · by decimon · 14 replies · 2+ views
    Stanford University ^ | December 16, 2010 | LOUIS BERGERON
    A new method of capturing detailed, three-dimensional images of minute samples of material under extreme pressures is shedding light on the evolution of the Earth's interior. Early results suggest that the early Earth did not have to be entirely molten to separate into the rocky crust and iron-rich core it has today. Researchers at Stanford University and SLAC National Accelerator Laboratory are leading the group pioneering the technique, which could lead to a wide range of new experiments.To answer the big questions, it often helps to look at the smallest details. That is the approach Stanford mineral physicist Wendy Mao...
  • First measurement of magnetic field in Earth's core

    12/16/2010 12:50:52 PM PST · by decimon · 17 replies
    University of California - Berkeley ^ | December 16, 2010 | Unknown
    Earth's internal dynamo generates average field in outer core 50 times that at surface A University of California, Berkeley, geophysicist has made the first-ever measurement of the strength of the magnetic field inside Earth's core, 1,800 miles underground. The magnetic field strength is 25 Gauss, or 50 times stronger than the magnetic field at the surface that makes compass needles align north-south. Though this number is in the middle of the range geophysicists predict, it puts constraints on the identity of the heat sources in the core that keep the internal dynamo running to maintain this magnetic field. "This is...
  • Does The Earth Harbors a Huge, Natural Nuclear Reactor at its Core -New Discovery Proves "No"

    03/31/2010 12:51:24 AM PDT · by ErnstStavroBlofeld · 15 replies · 742+ views
    The Daily Galaxy ^ | 3/30/2010 | The Daily Galaxy
    Using a delicate instrument located under a mountain in central Italy, two University of Massachusetts Amherst physicists are measuring some of the faintest and rarest particles ever detected, geo-neutrinos, with the greatest precision yet achieved. The data reveal, for the first time, a well defined signal, above background noise, of the extremely rare geo-neutrino particle from deep within Earth. The small number of anti-neutrinos detected, however, only a couple each month, helps to settle a long-standing question among geophysicists and geologists about whether our planet harbors a huge, natural nuclear reactor at its core. Geo-neutrinos are anti-neutrinos produced in the...
  • The earth's magnetic field impacts climate: Danish study

    01/15/2009 9:01:24 AM PST · by TaraP · 7 replies · 351+ views
    Terra Daily. ^ | Jan 12th, 2009
    The earth's climate has been significantly affected by the planet's magnetic field, according to a Danish study published Monday that could challenge the notion that human emissions are responsible for global warming. "Our results show a strong correlation between the strength of the earth's magnetic field and the amount of precipitation in the tropics," one of the two Danish geophysicists behind the study, Mads Faurschou Knudsen of the geology department at Aarhus University in western Denmark, told the Videnskab journal. He and his colleague Peter Riisager, of the Geological Survey of Denmark and Greenland (GEUS), compared a reconstruction of the...
  • The earth's magnetic field impacts climate: Danish study

    01/12/2009 6:33:01 PM PST · by NormsRevenge · 70 replies · 3,275+ views
    AFP on Yahoo ^ | 1/12/09 | AFP
    COPENHAGEN (AFP) – The earth's climate has been significantly affected by the planet's magnetic field, according to a Danish study published Monday that could challenge the notion that human emissions are responsible for global warming. "Our results show a strong correlation between the strength of the earth's magnetic field and the amount of precipitation in the tropics," one of the two Danish geophysicists behind the study, Mads Faurschou Knudsen of the geology department at Aarhus University in western Denmark, told the Videnskab journal. He and his colleague Peter Riisager, of the Geological Survey of Denmark and Greenland (GEUS), compared a...
  • Storm Hunt: Spacecraft Quintet to Track Down Magnetic Field Tempests (NASA’s THEMIS launches 2/15)

    01/24/2007 10:52:06 PM PST · by NormsRevenge · 9 replies · 327+ views
    Space.com on Yahoo ^ | 1/24/07 | Tariq Malik
    They may seem small and boxy, but five new NASA probes have a lofty purpose: sifting through the Earth’s magnetic field for the stormy beginnings of the planet’s most dynamic auroras. Set to launch in less than a month, NASA’s THEMIS spacecraft are designed to hunt down the origin of substorm -- tempests of high energy particles that accumulate somewhere in the Earth’s magnetic field, then flow back to the planet and supercharge its aurora borealis – also known as the Northern Lights [image]. “For more than 30 years the source location of these explosive energy releases has been sought...
  • Asteroid 2007 BB close fly-by (Moon)

    01/18/2007 12:17:02 AM PST · by Orlando · 35 replies · 1,572+ views
    NASA/JPL ^ | 1-18-07 | JPL
    Asteroid 2007 BB to pass between 0.0026 au or 0.0025 au. The distance to the moon is 0.00256 au(238,855 miles). Earth is okay from any impact. Just for your information.
  • Reversal of Earth's Magnetic Field-(Hey Algore read this)

    06/03/2006 7:00:13 AM PDT · by ThreePuttinDude · 71 replies · 2,690+ views
    Projects in Scientific Computing ^ | N/A | Gary Glatzmaier, Los Alamos National Laboratory
    Rush made mentioned this week of a core sample that showed evidence of tropical remains from an Arctic sample. Here are the results of a similar study done by a federally funded organization that claims this has been happening for........ever. Simulated three-dimensional structure of Earth's magnetic field, with inward (blue) and outward (yellow) directed field lines. Field lines extend two Earth radii from the core. The location of the core-mantle boundary is evident where the structure becomes complex
  • Ships' logs give clues to Earth's magnetic decline

    05/13/2006 9:51:41 AM PDT · by Crazieman · 59 replies · 1,699+ views
    New Scientist ^ | May 11, 2006 | Patrick Berry
    Ships' logs give clues to Earth's magnetic decline 19:00 11 May 2006 NewScientist.com news service Patrick Barry The voyages of Captain Cook have just yielded a new discovery: the gradual weakening of Earth’s magnetic field is a relatively recent phenomenon. The discovery has led experts to question whether the Earth is on track towards a polarity reversal. By sifting through ships’ logs recorded by Cook and other mariners dating back to 1590, researchers have greatly extended the period over which the behaviour of the magnetic field can be studied. The data show that the current decline in Earth's magnetism was...
  • Earthquakes and Tsunamis are triggered by Star-quakes

    03/06/2005 11:09:03 PM PST · by bd476 · 131 replies · 1,924+ views
    India Daily News ^ | March 7, 2005
    Earthquakes and Tsunamis are triggered by Star-quakes – the invisible interconnection between different parts of the Universe The position of SGR1806-20 in a radio image of the sky - 50,000 light-years away Staff Reporter Mar. 7, 2005 Computer models are showing an interesting relationship between star-quakes and earthquakes. Supernova, star-quakes and similar burst of energy in the Universe triggers earthquakes and tsunamis. According to researchers, most of the large earthquakes and Tsunamis happened when there was a burst of energy somewhere in the cosmos. According to BBC, Astronomers say they have been stunned by the amount of energy released in...
  • Will Compasses Point South?

    07/13/2004 7:25:26 AM PDT · by Servant of the 9 · 92 replies · 1,714+ views
    New York Times ^ | July 13, 2004 | WILLIAM J. BROAD
    The collapse of the Earth's magnetic field, which both guards the planet and guides many of its creatures, appears to have started in earnest about 150 years ago. The field's strength has waned 10 to 15 percent, and the deterioration has accelerated of late, increasing debate over whether it portends a reversal of the lines of magnetic force that normally envelop the Earth. During a reversal, the main field weakens, almost vanishes, then reappears with opposite polarity. Afterward, compass needles that normally point north would point south, and during the thousands of years of transition, much in the heavens and...
  • Ice Age coming into Focus!

    06/05/2004 2:32:35 PM PDT · by cureforcancer · 21 replies · 694+ views
    The Neutrino Report ^ | 1995, 2004 | Robert Texas Bailey(Tex)
    “In 1990 they found that the Earth goes through abrupt temperature changes from deep ice samples in Greenland of about 10,000 years ago the Earth’s temperature dropped 19 degrees” (research found by weather channel) taking 5-10 years (weather channel) but from analytical data, I intend to show this could take for the most part one year (Robert T Bailey) and more shocking a large part of the temperature change will happen this year! The End of the World as we known it is coming; an ice Age will change the face of the Earth. We have a crisis here. In...
  • Astronomy Picture of the Day 10-31-02

    10/30/2002 10:08:51 PM PST · by petuniasevan · 7 replies · 271+ views
    NASA ^ | 10-31-02 | Robert Nemiroff and Jerry Bonnell
    Astronomy Picture of the Day Discover the cosmos! Each day a different image or photograph of our fascinating universe is featured, along with a brief explanation written by a professional astronomer. 2002 October 31 Aurora in the Night Credit & Copyright: Juha Kinnunen Explanation: For much of the month of October, traveling shock waves from the Sun and solar wind gusts have buffeted planet Earth's magnetosphere. As a result, skywatchers at high latitudes in the northern hemisphere were treated to many displays of the aurora borealis or northern lights. For example, on the first of October this particularly ghostly apparition...
  • Astronomy Picture of the Day 9-20-02

    09/19/2002 9:32:57 PM PDT · by petuniasevan · 10 replies · 330+ views
    NASA ^ | 9-20-02 | Robert Nemiroff and Jerry Bonnell
    Astronomy Picture of the Day Discover the cosmos! Each day a different image or photograph of our fascinating universe is featured, along with a brief explanation written by a professional astronomer. 2002 September 20 The Crab Nebula Pulsar Shrugs Credit: J. Hester (ASU), CXC, HST, NOAO, NSF, NASA Explanation: How does a city-sized neutron star power the vast Crab Nebula? The expulsion of wisps of hot gas at high speeds appears to be at least part of the answer. Yesterday time-lapse movies taken from both the Chandra X-ray Observatory and the Hubble Space Telescope were released showing a wisp...
  • Astronomy Picture of the Day 8-05-02

    08/04/2002 9:35:41 PM PDT · by petuniasevan · 9 replies · 2,281+ views
    NASA ^ | 8-05-02 | Robert Nemiroff and Jerry Bonnell
    Astronomy Picture of the Day Discover the cosmos! Each day a different image or photograph of our fascinating universe is featured, along with a brief explanation written by a professional astronomer. 2002 August 5 Rays from an Unexpected Aurora Credit & Copyright: Lyndon Anderson (Prairie Journal) Explanation: This aurora was a bit of a surprise. For starters, last Friday morning, no intense auroral activity was expected at all. Possibly more surprising, however, the aurora appeared to show an usual structure of green rays from some locations. In the above image, captured from North Dakota, USA, a picket fence of...
  • Astronomy Picture of the Day 7-31-02

    07/30/2002 9:48:13 PM PDT · by petuniasevan · 11 replies · 316+ views
    NASA ^ | 7-31-02 | Robert Nemiroff and Jerry Bonnell
    Astronomy Picture of the Day Discover the cosmos! Each day a different image or photograph of our fascinating universe is featured, along with a brief explanation written by a professional astronomer. 2002 July 31 Henize 3-401: An Elongated Planetary Nebula Credit: R. Sahai (JPL/NASA) et al., HST, NASA, ESA Explanation: How do dying stars eject their outer layers? Stars that create elegant planetary nebulas like Henize 3-401, pictured above, are not unusual, causing speculation that, one day, our own Sun may look like this. Henize 3-401 is one of the most elongated planetary nebulas yet discovered, a particularly odd...
  • Astronomy Picture of the Day 7-14-02

    07/14/2002 1:44:33 PM PDT · by petuniasevan · 21 replies · 445+ views
    NASA ^ | 7-14-02 | Robert Nemiroff and Jerry Bonnell
    Astronomy Picture of the Day Discover the cosmos! Each day a different image or photograph of our fascinating universe is featured, along with a brief explanation written by a professional astronomer. 2002 July 14 The Crab Nebula from VLT Credit: FORS Team, 8.2-meter VLT, ESO Explanation: The Crab Nebula, filled with mysterious filaments, is the result of a star that was seen to explode in 1054 AD. This spectacular supernova explosion was recorded by Chinese and (quite probably) Anasazi Indian astronomers. The filaments are mysterious because they appear to have less mass than expelled in the original supernova and...
  • Astronomy Picture of the Day 6-24-02

    06/23/2002 9:24:42 PM PDT · by petuniasevan · 11 replies · 297+ views
    NASA ^ | 6-24-02 | Robert Nemiroff and Jerry Bonnell
    Astronomy Picture of the Day Discover the cosmos! Each day a different image or photograph of our fascinating universe is featured, along with a brief explanation written by a professional astronomer. 2002 June 24 The Sun's Heliosphere & Heliopause Credit & Copyright: P. C. Frisch (U. Chicago) et al., U. Indiana Explanation: Where does the Sun's influence end? Nobody is sure. Out past the orbits of Neptune and Pluto extends a region named the heliosphere where the Sun's magnetic field and particles from the Solar Wind continue to dominate. The surface where the Solar Wind drops below sound speed...
  • Astronomy Picture of the Day 5-21-02

    05/21/2002 8:05:50 PM PDT · by petuniasevan · 9 replies · 295+ views
    NASA ^ | 5-21-02 | Robert Nemiroff and Jerry Bonnell
    Astronomy Picture of the Day Discover the cosmos! Each day a different image or photograph of our fascinating universe is featured, along with a brief explanation written by a professional astronomer. 2002 May 21 The Galactic Center Radio Arc Credit: Farhad Yusef-Zadeh et al. (Northwestern), VLA, NRAO Explanation: What causes this unusual structure near the center of our Galaxy? The long parallel rays slanting across the top of the above radio image are known collectively as the Galactic Center Radio Arc and jut straight out from the Galactic plane. The Radio Arc is connected to the Galactic center by...