"Nasa might not be able to follow the progress of its big Mars rover all the way to the surface when it attempts to land on the planet on 6 August (GMT).
The Curiosity vehicle is aiming for a deep depression known as Gale Crater.
The US space agency will be tracking the descent with satellites, but its prime craft for the task may not now be in the correct place in the sky.
Engineers have been tackling a fault on the Odyssey satellite and it is no longer in the best observational orbit." info@als-alexander.org or interalex1@yahoo.com
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