All that traveling has taken a toll on the farthest human-made objects, and the spacecrafts days are numbered.
But electrical power is running low.
The Voyagers are powered by heat from decaying plutonium, which is converted into electricity.
An illustration of the Voyager spacecraft.NASA/JPL-Caltech
Each year, the aging spacecraft lose about 4 watts of power.
Some of the instruments were necessary to collect data during planetary flybys.
The Voyager spacecraft were then left with instruments designed to study the solar systems heliosphere and interstellar space.
That also means every day could be our last.
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