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Pioneer 10 becomes the first man-made object to leave the central Solar System when it passes beyond the orbit of Neptune.
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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)
Neptune
Eighth planet from the Sun
Neptune is the eighth and farthest known planet orbiting the Sun. It is the fourth-largest planet in the Solar System by diameter, the third-most-massive planet, and the densest giant planet. It is 17 times the mass of Earth. Compared to Uranus, its neighbouring ice giant,…Source: Wikipedia (CC BY-SA)