Current Events

  • 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.

Windows to the Universe original

Visitors to Windows to the Universe

Visitors to Windows to the Universe since September 1995. Notice the annual cycle of visitorship, with minima during the summer in the Northern Hemisphere.
Windows to the Universe original

Since the beginning of the Windows to the Universe website in 1995, we have records of the number of visits to the website from around the world. Early on, we noticed that there was an annual cycle to visitorship, with a minimum during the summer, a gradual rise in August, a peak in the Fall followed by a sharp drop in December. Visitors come back even more frequently in the Winter and Spring, dropping back in June once again. This pattern of visitorship strongly suggests that many of our users are associated with the school calendar in the Northern Hemisphere. However, as you'll notice in the graphic, the number of visitors to Windows to the Universe has increased substantially since the project started.

The September 11, 2001 attacks in New York caused a reduction in traffic growth that lasted about a year. In 2004, when we opened the Spanish version of the website, traffic increased dramatically - and interestingly - more than normal growth and the addition of visitors to the Spanish site would predict!

When you and your students visit the site during the school year, you can be assured that ~50,000 or more other learners are visiting the site, too!

Last modified July 24, 2006 by Roberta Johnson.

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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