Opportunity rover is still going strong after 8 years on Mars. Now we have 2 rovers working on Mars. Opportunity and the big new Curiosity which landed last month. Mysteries still being probed by the old Opportunity rover. Imagine what interesting findings await Curiosity as it's just getting started.
Photo By NASA/JPL-Caltech/Cornell Univ./ USGS/Modesto Junior College.
Opportunity's twin rover Spirit lasted until 2010.