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The two Voyager space probes, launched in August and September of 1977, are both still operational. Both are still radioing back observations from near the "heliopause", the point at which the solar wind of the Sun is overwhelmed by the galactic "wind" between the stars. Best guess estimates indicate that they could continue to operate to 2020 or beyond, but at some point around 2025, the radioisotope power supply will no longer be able to transmit a signal back to Earth.

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Q: What is the oldest probe still working?
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