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.

Earth Statistics

Planetary Symbol: Surface Gravity: 9.78 m/s^2
Diameter: 12,753 km (7,926 miles) Rotation Period with respect to Sun (Length of Day): 24 hrs
Mass: 5.98x10^24 kilograms
(6.5e21 tons)
Rotation Period with respect to stars (Sidereal Day): 23 hrs 56 min
Density: 5,515 kg/m^3 Revolution Period about the Sun (Length of a Year): 365 days 5 hrs
Minimum Distance from Sun: 146 million km
(91 million miles)
Tilt of Axis: 23o 27"
Maximum Distance from Sun: 152 million km
(94.5 million miles)
Temperature: -89o C to 57.7o C
(-128o F to 136o F)
Orbital Semimajor Axis: 1.0 AU Average Surface Temperature (K): 287K
Satellites: 1 (the Moon)

Earth Image Archive

Comparative Planetary Statistics -- in table form

Comparative Orbital Statistics -- in table form

Earth's circumference, aphelion, perihelion, speed and more...

Last modified February 16, 2001 by Jennifer Bergman.

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What is the distance from the Earth to the Sun when the Earth is at perihelion and when it is at aphelion? At what month is the Earth closest to the Sun? What is the circumference of the Earth? How fast is the Earth moving about its axis; how about around the Sun?

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