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Voyager 1, which is the farthest human-made object from Earth and the first to enter interstellar space, has been detecting a "faint, persistent hum" that scientists have attributed to interstellar gas.
Phys.org, citing research published in Nature Astronomy, reported that the spacecraft’s Plasma Wave System has picked up a "persistent signature produced by the tenuous near-vacuum of space.".
"In the case of a solar outburst, it’s like detecting a lightning burst in a thunderstorm and then it’s back to a gentle rain," he said.
Stella Koch Ocker, a doctoral student at the university, who lead the research, said, "We're detecting the faint, persistent hum of interstellar gas.