I recently finished A Briefer History of Time by Stephen Hawking. Hawking spends some time talking about the possibility of time travel, and discussing the various models of the universe that allow and don’t allow for it. He also mentions an intriguing thought – if time travel (for bodies larger than a single particle) is possible, then given enough time some human should eventually develop the technology, it would spread, and eventually someone would come back in time and say hi. Carl Sagan suggests that perhaps these space tourists are hiding themselves from us, and while Star Trek has already taught us the value of maintaining a stable time-space continuum, it is inevitable that eventually someone would let the secret slip. Since we haven’t seen any time travelers, two possibilities seem to exist, both extremely plausible:

1. Time travel is not possible (or at least not possible for objects larger than a single particle).
2. Long before time travel is developed and used, weapons capable of killing all of humanity are developed and used.

This entry was posted on Monday, April 13th, 2009 at 1:34 pm by Ari and is filed under Uncategorized. You can follow any responses to this entry through the RSS 2.0 feed. Both comments and pings are currently closed.