This is an interesting concept. I don't know about 2x gravity but 1.5x perhaps we could handle it (then again, I don't know how strong the heart is generally). One things for sure is that if you survived you'de end up a lot stronger than most people here. I don't think coming back would cause a problem however - at least not for semi-short periods such as a year - gravity in space is significantly less and we're capable of handling that.
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Le temps détruit tout
"Musicians are the carriers and communicators of spirit in the most immediate sense." - Kurt Elling
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