Happy Birthday Opportunity! | ScienceBlogs
Can you imagine driving around on roadless terrain with a four wheel drive vehicle for eight years and not ever changing a tire, getting a tuneup, adjusting the suspension, replacing the hydraulics or brakes, or doing any other service whatsoever on your vehicle? I've actually done that, and I'm here to tell you, you can't do that! But Mars Exploration Rover Opportunity has, in fact, done it.
Source: scienceblogs.com