We took a microphone on the Phoenix Mars Lander, and we turned it on but essentially heard nothing (white noise) so it was never released. We don't really need it for any experiments.
Ranger 9 was designed to achieve a lunar impact trajectory and to transmit high-resolution photographs of the lunar surface during the final minutes of flight up to impact. The spacecraft carried six television vidicon cameras, 2 wide angle (channel F, cameras A and B) and 4 narrow angle (channel P) to accomplish these objectives. The cameras were arranged in two separate chains, or channels, each self-contained with separate power supplies, timers, and transmitters so as to afford the greatest reliability and probability of obtaining high-quality Television pictures. No other experiments were carried on the spacecraft.
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