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Humans will make it to other planets one day. I don't see this one-way mission to Mars as something that will ever get done, but I do see a return flight one day. This month's Popular Science has an article about a new plasma engine that can make the trip in a few months instead of 2 years.
The Moon may be ruled out for the moment but if enough reasons to go somewhere would pop up, I'm sure we (humans) would find a way. I can see man returning to the moon and flying to Mars in our lifetime. What I would really love to see is the discovery of life in our own solar system. Jupiters moons IO and Europa are the best bets. I'd love to see NASA send a probe to these moons that could land and drill through the ice and hopefully sample a gallon of water full of life. That would be one of the biggest scientific discoveries ever.
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