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That is a very intriguing question! My assumption is that they are native, and simply get in where they fit in (and they can fit most anywhere). I'm not all too concerned about origins of life itself, and Tardigrades are at least part of the natural biosphere, albeit tougher than most of it.

They are certainly being panspermic of late, regardless of how they got here. I suppose the Rosetta Experiment, when we smashed a copper disc into an asteroid just to see what would happen, likely tossed a few out into the dark, where they await a bit of moisture today.

Who knows what may come of that in a few billion years.

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