article_snippet: On the left is a processed image of what Nasa believes Mars to look like .
article_snippet: The left image shows Mars as seen by the Hubble Space Telescope in July, 2001.
article_snippet: Centre is Mars as seens by the Hubble Space Telescope in March, 1997.
article_snippet: On the right is the red planet as seen by the Mars Global Surveyor in February, 2006 .
article_snippet: Centre is a guess of the 'natural' colour that humans would see if humans visited Mars.
article_snippet: Is this what Mars really looks like?