At this moment in time
those things are most likely not possible. The universe is still young, we're only on the second generation of stars, which means we have evolved from the remnants of the first stars around. This also means any alien life out there (and I do believe it is there) has been around for approximately the same, or less, amount of time as us. Faster than light travel is completely out of our reach, and, based on above, would be out of reach of any other life forms.

And as time travel requires faster than light travel, and throws up too many paradoxes, I do not believe this is possible.

I HAVE based all this on our current understanding of physics, I should have phrased my previous statement better.
(Ethong is enjoying Cardiff. Especially Bogiez., Mon 7 Jul 2008, 18:48, Reply)