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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
''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 atmos ...
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 C ...
. It was the first rock on Mars analyzed by the ''Sojourner'' rover using its Alpha Proton X-ray Spectrometer. The encounter occurred during Sol
Sol or SOL may refer to:
Astronomy
* The Sun
Currency
* SOL Project, a currency project in France
* French sol, or sou
* Argentine sol
* Bolivian sol, the currency of Bolivia from 1827 to 1864
* Peruvian sol, introduced in 1991
* Peruvian 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 roboti ...
'' 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
Andesite () is a volcanic rock of intermediate composition. In a general sense, it is the intermediate type between silica-poor basalt and silica-rich rhyolite. It is fine-grained (aphanitic) to porphyritic in texture, and is composed predomina ...
.
The name was inspired in mission scientists by barnacle
A barnacle is a type of arthropod constituting the subclass Cirripedia in the subphylum Crustacea, and is hence related to crabs and lobsters. Barnacles are exclusively marine, and tend to live in shallow and tidal waters, typically in erosive ...
-like structures on the rock that appeared in transmitted photos.
See also
*List of rocks on Mars
This is an alphabetical list of named rocks (and meteorites) found on Mars, by mission. This list is a sampling of rocks viewed, and is not an exhaustive listing. A more complete listing may be found on the various NASA mission web sites. This lis ...
* Yogi Rock
External links
''Mars Pathfinder'' Science Results
Rocks on Mars Mars Pathfinder {{crater-stub