Current Events

  • Kansas Legislator Proposes Bill to Outlaw Sustainability Education
    A bill has been introduced in the Kansas legislature this week that would prohibit the promotion of ...Read more

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    Kansas Legislator Proposes Bill to Outlaw Sustainability Education

    A bill has been introduced in the Kansas legislature this week that would prohibit the promotion of sustainability. Here is a link to the one-page bill: http://www.kslegislature.org/li/b2013_14/measures/documents/hb2366_00_0000.pdf. See report on Bloomberg News.
  • Earth's Center Is 1,000 Degrees Hotter Than Previously Thought, Synchrotron X-Ray Experiment Shows
    Scientists have determined the temperature near the Earth’s center to be 6000 degrees Celsius, 1000 ...Read more

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    Earth's Center Is 1,000 Degrees Hotter Than Previously Thought, Synchrotron X-Ray Experiment Shows

    Scientists have determined the temperature near the Earth’s center to be 6000 degrees Celsius, 1000 degrees hotter than in a previous experiment run 20 years ago. These measurements confirm geophysical models that the temperature difference between the solid core and the mantle above, must be at least 1500 degrees to explain why the Earth has a magnetic field. For more information about this study, see the press release from the European Synchrotron Radiation Facility.
  • Ocean Volcanic Rocks Contain Samples of Recycled Crust
    Scientists have long believed that lava erupted from certain oceanic volcanoes contains materials fr...Read more

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    Ocean Volcanic Rocks Contain Samples of Recycled Crust

    Scientists have long believed that lava erupted from certain oceanic volcanoes contains materials from the early Earth’s crust. But decisive evidence for this phenomenon has proven elusive. New research from a team including Carnegie’s Erik Hauri demonstrates that oceanic volcanic rocks contain samples of recycled crust dating back to the Archean era 2.5 billion years ago. Their work is published in Nature. Oceanic crust sinks into the Earth’s mantle at so-called subduction zones, where two plates come together. Much of what happens to the crust during this journey is unknown. Model-dependent studies for how long subducted material can exist in the mantle are uncertain and evidence of very old crust returning to Earth’s surface via upwellings of magma has not been found until now. For more information about these results, see the press release from the Carnegie Institution.
These two pictures show sunspots on the Sun. Sunspots only form near the Sun's equator. They never form near the Sun's poles.
Click on image for full size
Images courtesy of SOHO/NASA/ESA.

The Sun's Poles

Earth has a North Pole, a South Pole, and an equator. The Sun does too! Some things are different at the Sun's poles from the way they are near the Sun's equator.

The Sun has a magnetic field. The Sun's magnetic field has a North Magnetic Pole and a South Magnetic Pole. About every 11 years, the Sun's magnetic poles flip. North becomes South and South becomes North.

Did you know that the Sun has spots? Sunspots are dark places on the "surface" of the Sun. The magnetic field around sunspots is much, much stronger than normal. Sunspots only show up near the Sun's equator. We never see sunspots near the Sun's poles.

The Sun is a bit like a huge ball. However, it is not a solid ball. It is a ball made of gas and plasma. Some parts of the Sun-ball spin around faster than other parts. The part near the equator spins fastest. Places near the poles spin around more slowly.

The Sun has an atmosphere. The Sun's atmosphere near the poles is different from its atmosphere near the equator. The corona is part of the Sun's atmosphere. The corona sticks out further from the Sun's surface near the equator. The corona doesn't stick out as far above the poles. The solar wind is also different at the poles. It "blows" much faster above the poles than it does above the Sun's equator.

Last modified June 11, 2009 by Randy Russell.

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