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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 of electric blue noctilucent clouds was taken by astronaut Don Pettit while he was aboard the ISS.
Courtesy of Don Pettit and NASA TV

History of Observation of Noctilucent Clouds

Have you ever seen a noctilucent or "night-shining" cloud? Don't worry if you haven't - they are a fairly recent "discovery" in the world of science. Here's what we know!

The first reporting of these eerie clouds was made in the summer of 1885. The observations were made in northern Europe and Russia. The first photos of these clouds were taken in the late 1880’s.

In the early 1900’s, many scientists were trying to figure out what made these clouds form in the Earth's atmosphere. To figure this out, scientists started looking for these clouds more regularly - first in Europe in the late 1950's and in North America in the 1960's. The first rocket was launched into a noctilucent cloud in 1962.

In the more recent past, more observations made from the ground and satellites orbiting the Earth found that noctilucent clouds are mainly made of water ice. How they form exactly will be researched by the AIM satellite mission to be launched in 2006.

Crews aboard the International Space Station see noctilucent clouds while orbiting the Earth. You can be an observer of noctilucent clouds too and share that information with others on the Internet!

Last modified August 17, 2004 by Jennifer Bergman.

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