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The primary reason is to reduce the payload weight the rocket must lift, every pound lifted into orbit costs about $10,000 to get it there. Water needed to rehydrate it before it is eaten is not taken into orbit, it is available free as the waste product of the fuel cells that generate electricity for the spacecraft. Also some water on modern spacecraft is recycled from urine by using reverse osmosis to purify it.

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10y ago
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13y ago

Space on the ship, but they do not actually eat it dry, they add water to they stuff.

The food they take also has just what they need in it, nutritionally and it is physically easy to control, i.e. it wont float away.

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12y ago

Astronauts have to eat powdered food because other food won't work very good in 0 gravity

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11y ago

i think because thy cant eat real food in space...it will float away

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Q: Why do astronauts eat dry food?
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