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Well, the first one includes some high pressure I guess, and the second one some fluids I think.
Somehow I was fearing to get that answer.
It is really hard, especially if you sitting a mini #Starliner capsule riding home from our mini Lunar gateway called @MoonDotStation back to Earth! The acoustic is quite poor in this capsule! 
Hahaha, fair enough! Well, you can reply when you're back on Earth. 
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The sound is unforgettable, according to people who have experienced an Ariane 5 lifting off. But this week’s question should be really easy for experts like you! 
