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9May 2021
Late last month, NASA shared the first-ever aerial colour photo of Mars, captured by the space agency’s Mars Ingenuity helicopter. Now, it has shared groundbreaking audio from the same expedition, capturing the sound of the helicopter as it flies above the Martian surface.
Recorded via a microphone on board NASA’s Perseverance Mars rover (which was launched in 2020, and touched down on the planet’s surface in February this year) the audio marks the first time that a spacecraft has recorded the sounds of a separate spacecraft on another planet.
In a video released by NASA, space fans can hear wind blowing across Jezero Crater, before the hum of the helicopter’s blades as it performs its fourth flight, taking off 80 metres away.
In fact, NASA has massaged the audio sample above to help listeners hear Ingenuity. Sounds below 80Hz and above 90Hz have been turned down in volume so that the 84Hz hum of the tiny computer-controlled craft s rotors can be heard.
A small team at mission control has been experimenting with Ingenuity’s limits for about a month. Over that time, the small autonomous aircraft has performed a series of flights at increasing heights and speeds. The flight data is uploaded to Perseverance and sent back to Earth for the team to study, and the video above is taken from Ingenuity’s fourth flight when it traveled 133 metres south and stayed in the air 117 seconds.