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Virgil Catblanket

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  1. I think I actually said the opposite, that vibration did not reach the cabin interior, hence the lack of sound. In my opinion it would transmit sound so badly that you would either hear nothing, or hardly anything, in the cabin. Rocket exhaust makes a sound because it collides with air molecules, setting up a chaotic mixture of pressure waves. Since air molecules are floating freely it's very easy for the exhaust to create these chain-reactions of collisions. But the molecules in the rocket housing are not free to collide with each other like this. By design a
  2. Yes, but it will only be audible if the rocket is firing in an atmosphere. If the rocket is firing into a vacuum, how are you going to hear that noise? There's no air to transmit the sound. The astronauts were in a pressurised cabin, sealed off from the vacuum outside. There was no way for the noise of the roaring flame to travel through the vacuum and into the pressurised part of the module. The only way they would have heard a noise is if the back part of the rocket, that is, the part of the rocket that was inside the module with them, had rattled around. The rattling would have caused a noi
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