Listen closely👂
The microphone on @NASAPersevere's SuperCam caught sound during #MarsHelicopter’s 4th flight. The rumbling is Martian wind, but those rhythmic hums come from Ingenuity. Scientists made it easier to hear by isolating the 84 Hz blade sound. https://t.co/uua5h40BPL pic.twitter.com/fGWlMRpVji

— NASA JPL (@NASAJPL) May 7, 2021