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.
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.
Unlike the Earth, where clouds are found around the entire globe, on Mars, clouds seem to be plentiful only in the middle latitudes, as shown in this Hubble telescope image. This may be because water of...more
The Martian ionosphere is a layer of gas composed of ions and electrons that extends from about 75 miles up to several hundred miles up above the surface. The layer is shown schematically by the shaded...more
An important new result from the Mars Global Surveyor (MGS) mission is the definite confirmation of the presence of a magnetic field near Mars. The magnetic field leads to the formation of a magnetosphere,...more
The Mars Odyssey was launched April 7, 2001, from Cape Canaveral Air Force Station in Florida. After a six-month, 285 million-mile journey, the Odyssey arrived at Mars on October 24, 2001 (02:30 Universal...more
On September 12, 1997, the Mars Global Surveyor successfully entered a highly elliptical orbit around Mars. To get into the near-circular, near-polar, low-altitude orbit necessary to map the surface of...more
Mars Global Surveyor carries an instrument which measures the altitudes of things. The instrument is called an altimeter, or "altitude-meter". The graph to the left shows the results returned from Mars...more