There are already seven rovers that have arrived on Mars. There are still some rovers that are active in the year 2018. It is possible that they will continue sending more details and information to the people who are studying the planet here on earth. Learning about mars and even all the other unexplored planets can be very fascinating.
Aside from rovers, there are also different spacecraft that have landed on Mars in the past. Take note that most of the explorations going to Mars are unmanned. There have not been any exploration wherein human beings were required to man the spacecraft.
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