This was kind of a rough week for me, but we made it through. I hope you had a good week, and I hope that you have a wonderful and restful Easter weekend. See you on Monday.
| Credit: The New York Times |
The Delta IV Heavy burns ultracold liquid hydrogen, which is a high-performance fuel. In the final part of the countdown, to cool down the engines and prevent a sudden temperature shock that could cause cracks, liquid hydrogen starts flowing through the engine into the flame trench.
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