Which two planets have hosted a successful, sustained surface presence of human-made probes?
Answer
Venus and Mars
Only Venus and Mars among the primary planetary bodies in our solar system have successfully hosted a sustained surface presence by robotic probes, leading to a count of two other planets.
Related Questions
Which two planets have hosted a successful, sustained surface presence of human-made probes?Which Soviet program achieved the first successful landing on another planet?What was the primary engineering philosophy dictated by the environment of Venus?Which American lander successfully touched down on Mars in 1976?What are the two main categories of robotic explorers that have landed on Mars?Why are controlled surface landings considered infeasible on planets like Jupiter?Which Venera mission provided the first color panoramic images from the Venusian surface?What was the purpose of the Galileo probe's descent into Jupiter's atmosphere?Which non-planetary body hosted the European Space Agency's Philae lander?If counting only *other* planets, how many have hosted a successful sustained probe landing?Which of the following missions provided the first black-and-white images from the Venusian surface?What characterized the engineering philosophy adopted for long-duration missions on Mars?