Yes, the sound is fake. There is sound on Mars, though very quiet from our perspective, but the rover (and especially the lander) doesn't have a microphone.
An absolutely extraordinary feat of video editing. This isn't just from mere "splicing together" of photos; the original source is only 4fps and with much less color quality.
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[ 3.6 ms ] story [ 17.9 ms ] threadI did find this totally cool video that uses the status tones the lander sent back to earth, though: http://www.space.com/17110-screaming-down-to-mars-how-curios...