The space agency NASA has conceded defeat in its battle to free the Spirit rover from its Martian sand trap. The vehicle became stuck in soft soil back in May last year and all the efforts to extricate it have failed. Nasa says Spirit, which landed on the Red Planet just over six years ago, will now live out its remaining days as a static science station. Spirit and Opportunity were initially expected to work for 90 days back in 2004.
