Voyager 1 detects ‘hum’ while in interstellar space

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.” James Cordes, a professor of astronomy at Cornell University, reportedly described the sound as a “quiet or gentle rain.”