CNN Presented By Claire Evren & World News Actuality CNN Article & Exclusive Interview By Claire Evren Happy anniversary ! On Mars, Curiosity rover has done a lot in a long year A year is a very long time on Mars — 687 days. NASA’s Curiosity rover can attest that it’s enough time for some unexpected life changes. On Tuesday, the rover celebrated the Martian one-year anniversary of its touchdown on August 6, 2012. Looking back, some things have gone much better than anticipated, in spite of one nasty snag.