I wouldn't hesitate to go forward in time. Even if you managed to play Connecticut yankee in King Arthur's court, you would be going back without modern medicine and sanitation. You'll be taking a chance in either direction, but travel to the future could take you to the stars. Going to the past would get you an early grave.

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I say there is an invisible elf in my backyard. How do you prove that I am wrong?

Disclaimer: Avatar is not an official NASA image and does not imply any specific interplanetary or interstellar capability.

The Leif Ericson Cruiser