Nasa denies 'sexing up' mars images US space scientists have defended themselves against allegations that they tampered with images of Mars. The claim is that Nasa experts "tweaked" pictures sent back by the two Mars rovers to make it redder. A more extreme version of the conspiracy theory says Nasa doctored the colours to hide evidence of life, such as green patches, New Scientist magazine reported. The claims arise because of the strange appearance of certain colours seen on the rover spacecraft. Nasa said this was due to the photos being taken through green, blue and infrared - rather than...