The g-forces increased and I wasn't able to continue to hold the camera against the window, so I had to lay it back against my chest, but still continued to photograph the re-entry until there was no more unusual visual effects of the energy in the atmosphere. And it was very comforting to understand that the people in Houston, the controllers, had very high confidence that we were on the right path.
Climate has been changing for billions of years.
The energy varies with the square of the velocity, so if you need five times the velocity, that's 25 times the energy.
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