The Phoenix mission was launched in August 2007. Its goal is to look for traces of water on Mars and to prepare from possible future manned missions. See the Web Links to the left for more information. If you follow the link called 'Where Is Phoenix?' you can track its progress.
Currently all missions to Mars are unmanned. The only human aspect of these missions are the scientist and engineers that build the satellites or rovers/landers and the people that control them (mission control).
Curiosity is unmanned.
One of the best places for one to find images of Mars is on the NASA website. NASA has had numerous unmanned missions to Mars and has a vast collection of pictures of the planet. The latest such mission is the Mars Curiosity Rover.
No one went to Mars. It was an unmanned robotic expedition.
I am not sure if by "space mission" You mean a mission to a distant object or into deep space or manned or unmanned. Voyager I and II are unmanned deep space missions, both launched in 1977. More than thirty years later they are both still running (as of today: March 10, 2010). The unmanned Mars Exploration Rovers Spirit and Opportunity were rover launched to Mars in 2004. Opportunity is still running fine but Spirit is stationary because two of its six main wheels have stalled. The Apollo Missions were manned moon missions in the nineteen-sixties and seventies. They were also very successful.
Sending human beings to Mars is substantially more dangerous and expensive than sending an unmanned shuttle. It would take many days for astronauts to reach the red planet, and large quantities of supplies would need to be sent with them for them to survive the journey and to spend enough time on Mars to collect useful data and samples.
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The latest information about India is that they have a mission to the mars.
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Many American spacecraft have reached Mars. All were unmanned, however.
The mission of the Enterprise was to retrieve information and pictures of Mars by landing on the planet and collecting results it then sent back to Earth.