NASA’s Voyager 1 spacecraft has detected a strange humming sound in interstellar space that scientists are dubbing “persistent hum.” This noise is being picked up by its plasma wave instrument and caused by interactions between the interstellar medium and energy emitted by the spacecraft. Voyager 1 was launched in 1977 and has been traversing interstellar space since 2012, becoming the first human-made object to leave … Continue reading NASA’s Voyager 1 Probe Detects Humming Sound in Interstellar Space