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  • Atmospheric CO2 Level Tops 400 ppm
    During the week of May 13th, the CO2 level at the Mauna Loa Observatory in Hawaii topped 400 ppm rep...Read more

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    Atmospheric CO2 Level Tops 400 ppm

    During the week of May 13th, the CO2 level at the Mauna Loa Observatory in Hawaii topped 400 ppm repeatedly. Daily levels of CO2 can vary due to weather, and there are seasonal trends as well. The level of atmospheric greenhouse gases continues to increase, now over 120 ppm since the Industrial Revolution began. For more on the Keeling Curve, see http://keelingcurve.ucsd.edu/. Find out more about greenhouse gases and warming.
  • Massive Tornado Outbreak on Tornado Alley
    The week of May 19 brings dozens of tornadoes to Tornado Alley in the states of Oklahoma, Kansas, Io...Read more

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    Massive Tornado Outbreak on Tornado Alley

    The week of May 19 brings dozens of tornadoes to Tornado Alley in the states of Oklahoma, Kansas, Iowa, Illinois and Missouri. On May 20th, a massive tornado struck Moore, Oklahoma, devastating communities - destroying over 100 homes and hitting two elementary schools and a hospital - with many casualties and deaths. Our thoughts are with our friends and colleagues suffering from these storms. For more on the May 20th storms, see the NOAA Storm Prediction Center Storm Report.
  • 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.
This is an image of the Earth's moon, along with Saturn's icy moons for comparison.
Click on image for full size
Image from: NASA

A Comparison of Saturn's Icy Moons, and the Earth's Moon

This is an image of the Earth's moon, shown in the lower left, with the icy moons of Saturn.

The moons in order, starting from the top left are: Mimas, Enceladus, Tethys, Dione, Rhea, and Iapetus.


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Enceladus

Saturn has // Call the moon count function defined in the document head print_moon_count('saturn'); moons. Enceladus is one of them. Enceladus is the sixth biggest moon of Saturn. The diameter of Enceladus...more

Tethys

Tethys was discovered by G. Cassini in 1684. Tethys is the 8th closest moon to Saturn. Tethys is one of the icy moons. It is about as wide as the length of the Oregon coast. Tethys is has a surface, with...more

Dione

Dione was discovered by G. Cassini in 1684. Dione is the 7th farthest moon from Saturn. It is a small icy moon, lightly cratered, with white streaks across the surface. Dione is about as wide as the Oregon...more

Rhea

Rhea was discovered by G. Cassini in 1672. Rhea is the 5th farthest moon from Saturn. Rhea is one of the icy moons. Rhea is about as wide as the state of California is long. Rhea is has many craters and...more

A Comparison of Saturn's Icy Moons, and the Earth's Moon

This is an image of the Earth's moon, shown in the lower left, with the icy moons of Saturn. The moons in order, starting from the top left are: Mimas, Enceladus, Tethys, Dione, Rhea, and Iapetus. ...more

The Surface of Dione

The surface of Dione does not have many craters, which means that the surface has changed in the past. Instead of many craters, it has wispy white streaks like the ones on Rhea, which go for many kilometers...more

The Surface of Enceladus

The surface of Enceladus does not have many craters. Instead it has grooves similar to those found on Ganymede. These grooves extend for many kilometers over the surface. The presence of grooves indicates...more

Helene

Helene was discovered on February 29, 1980, by French scientists. Although Helene is very far away, they were able to see this small moon by using a powerful telescope and fancy camera. A few months later,...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