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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 Comet Shoemaker-Levy 9, broken into many pieces.
Click on image for full size
NASA/NSSDC and the Space Telescope Science Institute

The Discovery of Comet Shoemaker-Levy 9

Astronomer Gene Shoemaker has a partnership with his wife, Carolyn, and another astronomer named David Levy. Comet Shoemaker-Levy 9 was the ninth comet found by these partners.

The Shoemakers work in a separate observatory from that of David Levy. When the Shoemakers think they have found a candidate comet, they phone their partner so that he can also make an observation to be sure.

Comet Shoemaker-Levy 9 was discovered on the morning of March xx, 1993, and seemed to be a large, very strange, "squished" object. Subsequent pictures showed it to be a string of small objects (a "string of pearls").

The Shoemakers traced the collected orbits backwards in time and realized that it had passed very close by Jupiter and could have been torn apart by Jupiter's gravity. Then they realized that on it's next pass by Jupiter it was going to plunge directly in.

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The trajectory of Comet Shoemaker-Levy 9 over time

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The Jupiter family of comets

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What we learned from Comet Shoemaker-Levy 9

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The Comet Coma

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