There is currently no known law of physics that makes time travel impossible, and there are several methods by which someone or something could theoretically go back in time. So most scientists believe that while time travel is technically possible, it's far from practical, and would require extreme advances in science and technology.
How Stuff Works has a great article on how time travel might work:
http://science.howstuffworks.com/time-travel.htm
If you can pull your destination to where you start, and the destination is normally 4 light years away (Proxima Centauri), you will have traveled at the speed of 4 light years.
Technically this is physically impossible. It is about as likely as the dinosaurs coming back to earth.
There is no evidence that what is commonly known as "time travel" is possible at all.
Time travel is not possible, so it's not dangerous at all.
No,time travel is possible but it is somewhat difficult,as einstein said,"if an object travels with speed of light , the time near it would become slow and time travel wold be possible. All we need to is to produce such machine /spaceships that can travel up-to light's speed.
no, time travel is not possible so there is nothing to study
Yes, it was.
No
It is not possile to time travel, nor will it be in the near future.
Time travel is not practically possible no matter what your start point or destination.
There is currently no know and confirmed way to travel in time.
Basically, it isn't known whether time travel is at all possible.
You mean risking your life being stuck in something, million miles away from earth, because the earth is obviously not at the same position as it was when you was about to time travel? So is time travel possible?: maybe.
Time travel is possible. You can build a time machine with 10 million USD.