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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 ...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.
This image shows Comet Linear brightening when it blew off part of its crust. Clicking on this image will show you the Hubble Space Telescope's chronicle of the outburst.
Click on image for full size
Courtesy of the Hubble Space Telescope, NASA, and H. Weaver at Johns Hopkins University

Comet Linear

Comet Linear was discovered on September, 27 1999, by the Lincoln Near-Earth Asteroid Research program in New Mexico. Comet Linear came the closest to the Sun on July 26, 2000. It was still 114 million kilometers away though!

Scientists aren't sure if Comet Linear has ever been to our solar system before and they are not sure if it'll ever return. If the comet does return, it may be millions of years from now.

Compared to other recent comets like Hyakutake and Hale-Bopp, Comet Linear was a faint comet. At its brightest, it was only as bright as the faintest stars you can see without a telescope or binoculars. But, LINEAR did put on a great show for the Hubble Space Telescope. The Hubble was tracking the comet for two days, July 5-July 7. At 6:32 p.m. EDT on July 5th, comet Linear blew off a piece of its crust. The Hubble telescope watched the light brighten by an extra 50% in less than four hours. Astronomers were excited because they can learn about comet structure from this eruption.

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