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    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.
All of the meteors from the Lyrid meteor shower seem to come from one spot in the sky. The red dot shows that spot. It is by the constellation "Lyra". That's how the Lyrids got their name.
Image courtesy of NASA.

Lyrid Meteor Shower

Meteor showers are times when you can see a lot of meteors in one night. There is a meteor shower every year around April 22nd. It is called the Lyrid meteor shower.

During a meteor shower, it looks like all of the meteors shoot outward from one place in the sky. That place is called the "radiant" of the meteor shower. The radiant for the Lyrid shower is in the constellation Lyra. That is why this shower is called the Lyrid meteor shower.

Most years there are about 10-20 meteors per hour at the peak of the Lyrid shower. Sometimes there are a lot more. In 1803, 1922, 1945, and 1982 there were around 100 meteors per hour!

People have been seeing Lyrid meteors for a long, long time... longer than any other meteor shower. In 687 BC, Chinese astronomers wrote of "stars that fell like rain" - the Lyrid meteor shower. That was more than 26 centuries ago!

Last modified March 24, 2009 by Randy Russell.

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