#7. Human mission to Mars
As of September 2014 there have been 40 missions to Mars, including orbiters, landers and rovers. The most recent arrivals include the planet Mars Curiosity mission in 2012, the MAVEN mission, which arrived on September 22, 2014. The next mission was in 2016.The long-term goal of the U.S. space program is a human mission to Mars in the mid-2030s, NASA has said. The agency is currently developing more than three dozen technologies to ensure human health and support science goals for exploration beyond Earth orbit.