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Pioneer 10 travels beyond Pluto's orbit.
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Pioneer 10
First spacecraft to visit Jupiter and the outer Solar System (1972–2003)
Pioneer 10 is a NASA space probe launched in 1972 that completed the first mission to the planet Jupiter. Pioneer 10 became the first of five artificial objects to achieve the escape velocity needed to leave the Solar System. This space exploration project was conducted by the…Source: Wikipedia (CC BY-SA)
Pluto
Dwarf planet
Pluto is a dwarf planet in the Kuiper belt, a ring of bodies beyond the orbit of Neptune. It is the ninth-largest and tenth-most-massive known object to directly orbit the Sun. It is the largest known trans-Neptunian object by volume by a small margin, but is less massive than…Source: Wikipedia (CC BY-SA)