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This image of Martian clouds illustrates the fact that they are found only in the equatorial region.
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Image from: Hubble

Martian Clouds

Unlike the Earth, where clouds are found around the entire globe, on Mars, clouds seem to be plentiful only in the equatorial region, as shown in this Hubble telescope image. This may be because water of Mars may only be found at equatorial regions.

As early as 1796 scientists were reporting "yellow", and "white" or "bluish" clouds in the Martian atmosphere. With data from the Mariner 9 mission, scientists could finally prove that the clouds were made of water. Mars Global Surveyor is providing more proof of the existence of water clouds.

More study is needed to understand just how the clouds come and go in the Martian atmosphere. For example, even though clouds have been found, there is no proof it actually rains on Mars! Precipitation of water depends upon how cold it is. The temperatures in the atmosphere may be too cold for water to fall to the ground as droplets.

As a first step in answering some of those questions, Mars Pathfinder took measurements of many clouds in the Martian sky from the surface of Mars itself. Scientists are studying images of the Martian sky from the 80-day mission. The Mars '98 mission will carry a weather satellite, just like the instruments that are used to bring you the weather on the evening news. Then scientists expect to receive much more complete data about Martian weather.

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Windows to the Universe, a project of the National Earth Science Teachers Association, is sponsored in part is sponsored in part through grants from federal agencies (NASA and NOAA), and partnerships with affiliated organizations, including the American Geophysical Union, the Howard Hughes Medical Institute, the Earth System Information Partnership, the American Meteorological Society, the National Center for Science Education, and TERC. The American Geophysical Union and the American Geosciences Institute are Windows to the Universe Founding Partners. NESTA welcomes new Institutional Affiliates in support of our ongoing programs, as well as collaborations on new projects. Contact NESTA for more information. NASA ESIP NCSE HHMI AGU AGI AMS NOAA