Launched in 1977, the Voyager 1&2 continue to explore deeper into space than any instrument ever before. Using geometries and precise calculations, the space probes were able to perform flybys of Jupiter, Saturn, Titan, Uranus, and Neptune. Upon completion of the primary objectives, they were assigned the new mission of exploring further and further away from the Sun.
These space probes do their job using a system of computers, communication systems, scientific instruments, jet propulsion elements, and power sources. Using some pretty impressive engineering, the mission will continue to have enough power to feed data back to the Earth until 2025.
More recently, the Voyager 1 probe has reached interstellar space and the Voyager 2 is close behind. To give you some sense of scale, the Voyager 1 probe is currently 12.2 billion miles from Earth and the Voyager 2 probe is 10 billion miles from Earth.
Clayton Harrell - Astronomy 2110 
It’s pretty amazing that theses two missions were able to visit so many different celestial bodies. 10,000 different trajectories were calculated in the early 70’s before the two were chosen for the voyager missions. It’s cool to think that these two space probes will be functioning until 2025. It is even calculated that in 40,000 years voyager one will pass AC +79 3888, a star that lives 17.6 light-years from Earth.
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