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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.
The Constellation Centaurus, the Centaur
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Centaurus - The Centaur

Below the stars of Hydra, the sea serpent, and Scorpius, the acorpion, you can find the half-man, half-horse creature, Centaurus. He faces east holding a lance-like pole which he is using to kill Lupus, the wolf standing in front of him.

Centaurus' brightest star (Alpha Centauri), is called Toliman or Rigel Kentaurus. It's the third brightest star in the sky and the closest star to the Sun. Alpha Centauri is really a triple star: two components form a double star. The third component is a red dwarf, more than 2 degrees away from the bright pair. It is called Proxima Centauri (closest in Centaurus) because, of the three components, it is the closest to Earth, only a little more than 4 light-years away.

Centaurus is home to Omega Centauri (NGC 5139), the brightest and largest globular cluster in the sky. It is visible to the naked eye as a hazy spot of 4 minutes of arc. It is one of the closest globular clusters, at only 17,000 light-years away.

According to Greek mythology, it was Centaurus who first fashioned the constellations and taught humans how to read the sky. He placed a picture of himself in the sky to guide the Argonauts on their search for the Golden Fleece.

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Science, Evolution, and Creationism

How did life evolve on Earth? The answer to this question can help us understand our past and prepare for our future. Although evolution provides credible and reliable answers, polls show that many people turn away from science, seeking other explanations with which they are more comfortable....more

Hydra

Hydra is the longest constellation in the sky (>90 degrees) and is also the largest in terms of area. It is so long that it takes more than six hours to rise completely. Along its northern side are the...more

Scorpius

More than any other constellation, Scorpius resembles its given name. It is located low in the south for northern latitudes, but passes high in the sky for viewers in the southern hemisphere. The bright...more

Ophiuchus

The constellation Ophiuchus represents the Serpent Bearer. This large constellation can be seen in the night sky from June through October. Although most of the stars are dim, Ophiuchus' teapot shape...more

Gemini

Gemini is one of the more famous constellations. The Twins are best seen during the winter and early spring in the Northern Hemisphere. If you live in the Southern Hemisphere, look for Gemini in the summer....more

Sagittarius

Sagittarius is a centaur, with the torso of a man atop the body of a horse. Unlike the wise and peaceful centaur Chiron (Centaurus), Sagittarius is aiming his giant bow at his neighbor, Scorpius. While...more

Bootes

Bootes, the herdsman, rides through the sky during the late Spring and early Summer. While he may have appeared as a shepherd to the ancients, modern star-gazers like us can easily recognize the shape...more

Leo

Leo, the Lion, is a very majestic feline. Leo's head and mane are formed by an asterism known as the Sickle which looks like a backward question mark. One of the brightest spring stars, Regulus (Latin...more

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Windows to the Universe, a project of the National Earth Science Teachers Association, is sponsored in part by the National Science Foundation and NASA, our Founding Partners (the American Geophysical Union and American Geosciences Institute) as well as through Institutional, Contributing, and Affiliate Partners, individual memberships and generous donors. Thank you for your support! NASA AGU AGI NSF