The US space program, including NASA, has successfully visited several planets in our solar system. These include Venus, Mars, Jupiter, Saturn, and Pluto (visited by the New Horizons spacecraft). Additionally, various probes have been sent to study other celestial bodies like comets, asteroids, and moons.
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There are many planets in our solar system that have not been visited by a spacecraft. As of now, the planet Uranus has not been visited by any spacecraft.
The name of the space probe that visited outer planets is Voyager. Voyager 1 and Voyager 2 were launched by NASA in 1977 to explore the outer planets of our solar system, including Jupiter, Saturn, Uranus, and Neptune.
The space probe collected data on distant planets to study their atmospheres.
Pluto was the only planet not visited by a space mariner space probe.
In 1969 the U.S. successfully landed two men on the moon for the first time.