Using images from NASA’s Voyager Mission (1979) and the orbital Galileo Mission (1995), researchers have created the first global geological map of Ganymede, Jupiter’s largest moon, the largest in the solar system, and the only moon with its own magnetic field. With its varied terrain and possible underground ocean, Ganymede is considered a prime target in the search for habitable environments in the solar system, and the researchers hope this new map will aid in future exploration. The work, led by Geoffrey Collins, a Ph.D. graduate of Brown now a professor at Wheaton College in Massachusetts, took years to complete. The map was published today by the U.S. Geological Survey.
The researchers combined images from the Voyager and Galileo spacecraft to put the map together. Voyager was the first mission to fly through the Jupiter satellite system and passed by the icy surface of Ganymede in 1979. Those first images revealed a complex surface, segmented and fractured into dark and light terrain. In 1995, the Galileo spacecraft was placed in orbit around Jupiter and began to return high-resolution images of the surface that help to understand many of the features seen at low-resolution by Voyager.
Head was a co-investigator on the Galileo’s Solid State Imaging (SSI) experiment. In that role, he and his team were responsible for planning the imaging sequences for Ganymede in order to identify and investigate the scientific targets of highest priority. The team worked for several years to obtain the data necessary to make the global map.
“This was an amazing time,” said Jim Head, the Scherck Distinguished Professor of Geological Sciences at Brown and one of the map’s co-authors. “Brown graduate and undergraduate students worked shoulder-to-shoulder in the Planetary Geosciences Laboratory in Lincoln Field Building, studying the newly acquired images and choosing new sites of scientific interest. The discoveries were daily and the adrenaline was surging as we rushed to collect our thoughts and plans, review them with the SSI Team, and get them uploaded to the spacecraft in time for the next encounter.”
The Daily Galaxy via Brown University
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