A dark volcanic rock dubbed "Humphrey," about 60 centimeters (2 feet) tall, shows bright material ... exposure of "Humphrey" where Spirit's rock abrasion tool scraped away the rock's surface ...

His second rock tower, standing 3 or so feet tall, looked strong and stable. "The first one? That was that sound you heard a few minutes ago," Koel, 55, said with a chuckle. That sound - the ...

A dark volcanic rock dubbed “Humphrey,” about 60 centimeters (2 feet) tall, shows bright material ... of “Humphrey” where Spirit’s rock abrasion tool scraped away the rock’s surface ...