Hard rock on Mars?
Anyone know of images of this rock?
Mars Rover Fails to Dig Hole in Rock
LOS ANGELES — The sophisticated grinding tool deployed by NASA's rover Opportunity was apparently no match for a chunk of martian rock.
http://abclocal.go.com/kabc/news/030804_nw_mars_rover.html
The RAT is supposed to be able to grind rocks at least of the hardness of basalt which is 6 to 7 on the Mohs hardness scale.
Bob Clark