I see no reason, why uploading would be impossible. As I see no reason, why interstellar traveling would be impossible.

I have no idea how to actually do both, but that's another matter.

If the naturalistic view is valid, it is difficult to see a reason why those two would be impossible. But if the Universe is a magic place, then of course. It's possible that they are both impossible due to some spell of a witch, or something.

Still, I do assign a small probability to the possibility, that the consciousnesses is something not entirely computable and therefor not executable on some model of a Turing machine. But then again, the probability for this I see quite negligible.