The British Government would back another mission to Mars if the present Beagle-2 attempt fails, the Science minister, Lord Sainsbury of Turville, said yesterday. British scientists now think that the missing lander, which entered the planet’s atmosphere on Christmas Day but has since sent back no signals, could have fallen into a crater known to be in the middle of the landing zone and may be damaged, or unable to get any sunlight to recharge its batteries.