Logistics sets some applicable limits: Animals require food, produce waste. The larger the animals, the more resources required. In an environment where every gram is expensive, this means animals should be small. Something with a will on it's own moving among critical equipment is hard to plan for. Animals should therefore be confined to their own ...


Cats, dogs, mice or rabbit as pets in zero gravity would be a problem, training them to use a zero gravity toilet would be at least very difficult if not impossible. Similar problems with eating and drinking.


I can add a little bit more to Hobbes' great answer. ESA cooperates extensively with NASA on a range of projects; the ISS is the biggest, but ESA and NASA are very enmeshed in each other's operations. Almost all of this cooperation is done on a barter basis, where on side provides, say, an instrument, and the other side provides launch, or whatever. The ...


I would be fascinated to see how something like a sugar glider or flying squirrel would do in microgravity. Tiny, omnivorous, and can be kept as pets. I wouldn't be surprised if they could eventually figure out how to use their gliding membranes to fly/swim/otherwise move around.

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