When I was a kind my favorite part of the science museum wasn't the earthquake model or the Van De Graaff generator (the big silver ball that made your hair stand on end with static electricity) or even the animatronic dinosaur. Those were all cool, yes, but they didn't compare to the packet of astronaut ice cream I'd get at the gift shop at the end of the day. Reading about the spacewalkers from the Endeavor mission today, I was reminded of my favorite childhood treat. Packaged in hard silver bags, the ice cream looked more like fat sticks of sidewalk chalk than anything else. Biting into it, it had the texture of sidewalk chalk as well, though strangely light, until it melted in my mouth in a fizzy puddle and was gone in an instant, leaving me with a sticky mouth and the lingering taste of fake chocolate. Loved it, loved it, loved it.
I looked into whether it's possible to make freeze dried ice cream at home, and unfortunately it looks like it's not (but if I'm wrong, please let me know!), but I did find this cool description of how astronaut ice cream is made. The ice cream is frozen to -40° Fahrenheit and placed in a vacuum chamber. The chamber is heated, vaporizing the ice and dehydrating the ice cream. Can I really not make this at home?
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