This article has multiple issues. Please help improve it or discuss these issues on the talk page. (Learn how and when to remove these template messages) The topic of this article may not meet Wikipedia's general notability guideline. Please help to demonstrate the notability of the topic by citing reliable secondary sources that are independent of the topic and provide significant coverage of it beyond a mere trivial mention. If notability cannot be shown, the article is likely to be merged, redirected, or deleted. Find sources: "Barnacle Bill" Martian rock – news · newspapers · books · scholar · JSTOR (March 2024) (Learn how and when to remove this message) This article relies largely or entirely on a single source. Relevant discussion may be found on the talk page. Please help improve this article by introducing citations to additional sources. Find sources: "Barnacle Bill" Martian rock – news · newspapers · books · scholar · JSTOR (March 2024) This article includes a list of references, related reading, or external links, but its sources remain unclear because it lacks inline citations. Please help improve this article by introducing more precise citations. (March 2024) (Learn how and when to remove this message) (Learn how and when to remove this message)

Barnacle Bill rock

Sojourner rover next to the "Barnacle Bill" rock
Feature type	Rock
Coordinates	19°20′N 33°33′W / 19.33°N 33.55°W / 19.33; -33.55

Barnacle Bill is a 40-centimetre (16 in) rock on Mars in Ares Vallis. 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 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

Wikimedia Commons has media related to Barnacle Bill (Martian rock).

• List of rocks on Mars
• Yogi Rock

External links

• Mars Pathfinder Science Results

Notable rocks on Mars

Adirondack (Spirit)	Barnacle Bill (Sojourner)	Bathurst Inlet (Curiosity)	Big Joe (Viking)	Block Island (Opportunity) M	Bounce (Opportunity)	Coronation (Curiosity)	El Capitan (Opportunity)
Esperance (Opportunity)	Goulburn (Curiosity)	Heat Shield (Opportunity) M	Home Plate (Spirit)	Hottah (Curiosity)	Jake Matijevic (Curiosity)	Last Chance (Opportunity)	Link (Curiosity)
Mackinac Island (Opportunity) M	Mimi (Spirit)	Oileán Ruaidh (Opportunity) M	Pot of Gold (Spirit)	Rocknest 3 (Curiosity)	Shelter Island (Opportunity) M	Tintina (Curiosity)	Yogi (Sojourner)
M = Meteorite - ( This box: view talk edit )

This article about the planet Mars or its moons is a stub. You can help Wikipedia by expanding it.

• v
• t
• e

This article about an extraterrestrial geological feature is a stub. You can help Wikipedia by expanding it.

• v
• t
• e