Answer:
These are spacecraft, see the related links.
The Voyager 1 spacecraft is a 722-kilogram (1,592 lb) robotic space probe of the outer Solar System and beyond, launched September 5, 1977. It still receives commands from, and transmits information to Earth, currently pursuing its extended mission to locate and study the boundaries of the solar System, including the Kuiper belt and beyond.
The Voyager 2 spacecraft is an unmanned interplanetary space probe launched on August 20, 1977. Voyager 2 was launched on a slower, more curved trajectory that allowed it to be kept in the plane of the Ecliptic (the plane of the Solar System) so that it could be sent on to Uranus and Neptune by means of utilizing gravity assists during its fly-by of Saturn in 1981 and of Uranus in 1986.