How many spacecraft landed to Mars?

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Mars is the Solar system’s fourth planet. There was a common belief that Mars has liquid water before first flyby happened in 1965. But after first flies over Mars, people believed there’s no water. Then in 2005, radar caught water on Mars surface. Lastly The Phoenix lander sampled water on the Mars surface. There are lots of Mars missions since 1969. How many spacecraft landed to Mars?  more...