Yeah sure. We need to figure out a lot of technological challenges first before embanking on interstellar travel. That calls for more investments and research in space technology. This is should be our first order of business on our long term mission to colonize space. Artificial gravity, close to light speed travel, radiation as you've stated, space travel preparation procedures, health in space all this are challenges we need to deal with. May take some time but as long as it can be done, nothing should hold us back.
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