Очень прозрачное и понятное объяснение того, в чём трудность выхода на орбиту:
The reason it's hard to get to orbit isn't that space is high up. It's hard to get to orbit because you have to go so fast.
The reason it's hard to get to orbit isn't that space is high up.
It's hard to get to orbit because you have to go so fast.
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