NASA's Voyager 1 and 2 launched in 1977 have completed 40 years of space exploration and still on their extraordinary odyssey .
Voyager 1 as of now is at 20 billion km from the sun, NASA officials say Voyager 1 will have enough power to keep communicating with Earth until 2020, possibly 2025. Destined to wander the Milky Way .
The primary mission was to conduct close-up studies of Jupiter and Saturn, Saturn's rings, and the larger moons of the two planets.
Like Voyager 1, Voyager 2 is still active and operational. It took a different route through the solar system, Voyager 2 went on to explore Uranus and Neptune, and is still the only spacecraft to have visited those outer planets and is expected to follow its twin into interstellar space a few years from now.
Both spacecraft are still sending scientific information about their surroundings through the Deep Space Network, or DSN.
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