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Barnacle Bill is a rock on 
Early analysis of data sent from ''Sojourner'' led scientists to speculate that the rock was andesite.
The name was inspired in mission scientists by barnacle-like structures on the rock that appeared in transmitted photos.
''Mars Pathfinder'' Science Results
Rocks on Mars Mars Pathfinder {{crater-stub
Mars
Mars is the fourth planet from the Sun and the second-smallest planet in the Solar System, only being larger than Mercury. In the English language, Mars is named for the Roman god of war. Mars is a terrestrial planet with a thin at ...
in Ares Vallis
Ares Vallis is an outflow channel on Mars, named after the Greek name for Mars: Ares, the god of war; it appears to have been carved by fluids, perhaps water. The valley 'flows' northwest out of the hilly Margaritifer Terra, where the Iani ...
. It was the first rock on Mars analyzed by the ''Sojourner'' rover using its Alpha Proton X-ray Spectrometer. The encounter occurred during Sol 3 of the ''Mars Pathfinder
''Mars Pathfinder'' (''MESUR Pathfinder'') is an American robotic spacecraft that landed a base station with a roving probe on Mars in 1997. It consisted of a lander, renamed the Carl Sagan Memorial Station, and a lightweight, wheeled robot ...
'' mission on the surface of Mars and took ten hours to complete.
Early analysis of data sent from ''Sojourner'' led scientists to speculate that the rock was andesite.
The name was inspired in mission scientists by barnacle-like structures on the rock that appeared in transmitted photos.
See also
* List of rocks on Mars * Yogi RockExternal links
''Mars Pathfinder'' Science Results
Rocks on Mars Mars Pathfinder {{crater-stub