Spirit's mission ended after getting caught in soft soil in 2009 and succumbing to the Martian winter.

BBC: Opportunity and Curiosity find similar rocks on Mars

The soil in this part of the Kuwaiti desert was as soft as a New York sidewalk.

CNN: Digging in with the Marines

She, like Juan, feels an affinity with the colours of her adopted homeland: Isabelle's hair is gathered round her face in soft, red curls and she jokes that her scalp has soaked up the shades of the soil.

BBC: The three colours of Ibiza