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The first martian rover was the Sojoner rover by NASA (US)
The US built the Mars Rover
The mars rover sends us information on the planets surface.
There is a small collection of hardware like the Mars Rover(s) and other Mars landers on the planet, yes - but everything that could be called a "spaceship" that is on Mars came from earth, and was sent by us.
The ''Mars Lander''
Radio waves travel at the speed of light. When the Spirit rover landed on Mars, signals were able to be sent from the Earth to Mars in 9 minutes 30 seconds. Unfortunately, the rover became stuck and hasn't sent a signal to Earth since March 22, 2010.
I believe the US was the only country involved with the development and launch of the Mars Rover Spirit.
The U.S. has sent a number of space probes to the planet Mars. Several have been orbiting camera platforms, while others have been rovers or lander.
The probe launched on November 26, 2011 is called the Mars Science Laboratory, and includes a new larger rover called Curiosity. The probe will arrive at Mars in August 2012.
No. The only object in space that people have visited is the moon. The US has, however, sent several robotic rovers to Mars.
Eventually they will all fail to respond. So I'll just list those that were complete failures; i.e. they did not deploy at all. SO far the successful rovers on Mars are: Sojourner(US), Opportunity(US), Spirit(US), and now Curiosity(US) have all deployed and sent back data. All of them have completed their original missions except for Curiosity as it has just landed and not yet completed its slated 2-year mission. The Soviets have lost 2 rovers. The first one, named Mars 2, crashed on landing/ The second one, Mars 3, landed but communication was soon lost. Both of those were a lander/rover combination. The UK has also lost a lander/rover combination, Beagle 2, which failed to communicate back to controllers after separation from the Mars Express craft. Whether it successfully landed, crash landed, or burned up in the martian atmosphere is unknown to this day.
All of the versions of the Mars rovers that the United States has produced and used have had wheels. However, the US had prototypes of ones with continuous tracks, or tank tracks. China and Russia have also explored the moon and Mars with similar type apparatuses.