Scientists know that evidence must be continually questioned in order to validate scientific knowledge. Improvements to the tools and techniques of scientific investigation such as NASA's Mars Global Surveyor spacecraft, have facilitated the search for new evidence in order to test existing theories and have led to new discoveries. Experimentation, collecting evidence, finding relationships, proposing explanations, and imagination all play key roles in the development of scientific knowledge and have contributed to what could turn out to be a landmark discovery in the history of Mars exploration.

According to a June 22, 2000 press release from the Jet Propulsion Laboratory (JPL) California Institute of Technology, NASA, imaging scientists using data from NASA's Mars Global Surveyor spacecraft have recently observed features that suggest there may be current sources of liquid water at or near the surface of Mars.

The new images, available at or , show the smallest features ever observed from martian orbit -- about the size of a sport-utility vehicle. NASA scientists compare the features to those left by flash floods on Earth.

The findings will be published in the June 30 issue of Science magazine. For more information, text of the NASA press release and images, see Resources for Teachers below.

The YES I Can! Science database contains background information for teachers as well as curriculum-linked classroom activities for teachers to use while following this current scientific discovery.

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updated 06/00