First thunder heard on another planet
The USSR's Venera 11 lander touched down on Venus on 25 December 1978. Amongst its instruments was an acoustic detector capable of registering sound in the Venusian sky and on its surface. During its parachute descent the detector heard the sound of the wind, and it picked up the noises of the lander's other equipment operating just after touchdown. 32 minutes after landing another sound of unknown origin with a level of 82 decibels was detected. A Venusian thunder clap is the most likely explanation.