I'm not sure if this is the right forum. I'm sorry, but I'm not good at Physics or English (which is not my first language). I was just wondering, after watching a show on the Discovery Channel that mentioned the Alcubierre Drive. Then I went on the internet and read about it and all the difficulties (and probable impossibility) of actually building one. Then I kept on reading and found out about the Krasnikov tube which is a little more confusing. Anyway, I don't understand the equations at all (I'm just a regular 14yo), so I can't figure this out by myself: Assuming an Alcubierre drive is hypothetically possible, would also be possible to build something similar to an Alcubierre drive (in the sense that it would contract space in front of the craft and expand it behind it), but that wouldn't allow faster than light travel, but just regular slower than light travel instead? And in case that such slower than light drive would be hypothetically possible, are all the things that are not plausible (like negative energy) in an Alcubierre drive still needed if you wanted to build this slower version of it? Would this slower than light version of the Alcubierre drive be faster than our current means of space travel? And lastly, would this form of transportation be more easily accomplished if made in the form of a Krasnikov tunnel instead? Thank you. Sorry if it's badly written, but it took me a long long time (49 minutes) to write it, so it's the best I could do.