Opportunity and Spirit, two from the longest lasting rover missions in NASA history, were built to run for 90 Martian days. Those candidates who lack prior air traffic control experience must be three decades of age or less. He first dipped into centrifuge training, a supersonic jet flight, and a Zero-Gravity flight before finally moving on to the final stage. While visiting these lush areas, you get an opportunity to set up a unique relation with nature.