NASA Mars rover expected to last 90 days completes 5000 days
NASA's solar-powered Mars rover Opportunity, expected to last for 90 days, has completed 5,000 Martian days since landing on the Red Planet in 2004. Called "sol", a Martian day lasts 40 minutes longer than a day on Earth. Opportunity has driven over 45 km from its landing site, sending back about 225,000 images which provided evidence of groundwater on Mars.