Personally, I think time travel is possible. But, if one was to go back in time, it could alter history, causing said being to return to a different time line. It's not impossible that aliens are actually future humans (after all, their characteristics resemble famine like features...and we are facing global warming).

Nah, they are just Grey-reptile hybrids
http://en.wikipedia.org/wiki/Little_green_men

it is far easier to travel through time then to go millions of light years to a planet. evolution of man is taking place even now. we rely more and more on tech to survive and less on nature.Soon natural births will not be able to take place
think harder about who what when and why and the simplicity of it will asound you.

If I understand correctly the subject, then it is about degradation of humanity. Yes, every year we become weaker, we begin to depend on the amount of money in our pockets, from the mechanisms that will soon start working for us, but we'll just have to postpone their fat ...

Alright, I wanted to bring this back to the original person who started this thread..
Wow, I stumbled on this OLD thread.. and someday another person will again while searching for similar feelings..

"Would it be out of sink to say that the visitors are not from another planet but from a different time. Future evolved humans coming back to the past to see there evolution and visit the earth when it was still blue. Abductions are not just for info but for cures to future diseases. Think of it like a trip to the rain forest. The beautiful sights, the future cures and unstoppable destruction of. If everything started with a big bang then our matter and everything started at the beginning. No other being could have enough of a head start to be ahead of our progress (at least not to the point of multi-light speeds and universal mapping). "

Why do these abductions and encounters all end up looking human like?

Yesterday, I watched a documentary on how they found specific genes that changed between homo-sapiens and Apes. It was in the jaw muscles. The muscles in apes are so large that it keeps the skull size small. So they now say that is how humans were able to evolve mentally.
Eugenics gene therapy is something happening now and will advance in the future. What if man, in the future, our primary goal is to improve our intellectual capacity on advancing ourselves by enlarging the brain, I truly believe this will happen. At the 'End of the day' the brain is the most important thing. And maybe humans 'Decide' to evolve into something that is the same as the other on the outside to rid of outside judgments and create equality. And obviously the eyes are also important. What you create after this, is a human that looks like the 'typical' alien. Why would we be coming back in time to research? To get something they/we need. Maybe genes that were still unchanged. Maybe to place antibodies in this 'blood line' to fight against a future threat.

If anyone knows of any Movies/books/theories like this, I would be interested in seeing them.
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Believe it or not from my comments, I am religious. It's just an idea that crosses me sometimes..