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Late reply but about the above comment well there is no need for space travel to be sad not having time travel. I am not actually sad I don't have time travel but have definitely day dreamed many times about how incredible it would be to have such a power. Not to change the past but to just go back and witness events. But I don't believe that would ever be possible so like to think about it but not saddened about it. As for being sad about not leaving the solar system well it's about the same as time travel. I have already accepted the fact that humans will likely never get very far from earth without some discovery that goes against everything we know like a way to bend space or travel many times faster then the speed of light. I just want to float in space and look back on earth and feel the profound sense others who have done so describe. Cheers