1 million years in the future, one billion years.. Just think about that for a second...
Our civilization has been around for roughly 8-10K years, as we see it today, agriculture, literature, etc.
What could happen 10,000 times from now? That amount of time has happened TEN THOUSAND times over... what would our species look like then? Consider the time it took us to advance from human flight to space flight. 58 years from the first manned flight to a man in space...
What could we do in A MILLION years? 1,000,000. A BILLION? 1,000,000,000!
Is time travel impossible? (if not, why aren't there time travelers from the future visiting us right now?)
Invisibility? Human flight? Telepathy?..
Is anything impossible, given the extent of future technology?