|It's been a long trip for the Martian rover Opportunity.
Last week Opportunity surpassed
Viking 1 as the
longest running mission on
Mars, now extending well over six years.
Pictured above, Opportunity's tire tracks cross a nearly featureless Martian desert, emanating from a distant horizon.
Landing in 2004 in
robotic Opportunity has
on its longest and most
dangerous trek yet, now aiming to reach large
Endeavor Crater sometime next year.
Endeavor, it is hoped, holds new clues to the ancient
geology of Mars and whether Mars could once have
Exploration Rover Mission,