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The Rover studies Barnacle Bill.
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Image from: NASA/JPL

Barnacle Bill

Barnacle Bill was the first rock to be explored by the Rover. It was found north by northwest of the Mars Pathfinder lander.

Barnacle Bill was a dark rock. Scientists think that may mean it is a basalt or a special kind of basalt called an andesite. It had many small holes over its surface (vesicles) but otherwise did not appear to be well eroded. These features help scientists figure out the possible origin of Barnacle Bill. Barnacle Bill may have been put in place by flowing water. Rocky outcroppings 30 km away also seem to be made of basalt or andesite. On the other hand, Barnacle Bill might be left over from the formation of the nearby crater called "Big Crater".


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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