Voyager_s Final Discovery Before Leaving the Solar System
A faint hum detected 23 billion kilometers from home. The whisper of interstellar plasma, the ghost of ancient supernovae, and a countdown clock ticking toward eternal silence. The most distant human-made object has one last secret to share.In August 2012, Voyager 1 became the first spacecraft to cross the heliopause, the invisible boundary where the Sun's influence ends and interstellar space begins [citation:4][citation:8]. But crossing was not enough. The spacecraft needed to taste the cosmos. Using its plasma wave antennas, Voyager detected vibrations in the surrounding gas—a "hum" at…
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