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Pioneer 10 passed the orbit of Neptune, becoming the first man-made object to leave the proximity of the major planets of the Solar System.
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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)
Solar System
The Sun and objects orbiting it
The Solar System consists of the Sun and the objects that orbit it. The name comes from Sōl, the Latin name for the Sun. It formed about 4.6 billion years ago when a dense region of a molecular cloud collapsed, creating the Sun and a protoplanetary disc from which the orbiting…Source: Wikipedia (CC BY-SA)