Perseverance captured audio of Ingenuity during its fourth flight on Mars on April 30
It is the first time a spacecraft on another planet has recorded sound of a separate craft
The audio captures dim humming of the helicopter's rotors as it flew
The rover sat 262ft from the solar helicopter and NASA said it was a surprise to hear the hum of the rotors due to the thin Martian atmosphere
Ingenuity is set to make its fifth flight Friday with take off at 3:26pm ET