Okay, I read this on a blog so I'd post it the way it ias with the link: "There is one aspect of time travel that nobody considers, whether in science or science-fiction (at least, i am not aware of it), something that has the potential of rendering time travel, even if it is possible, totally futile. So, what is it? In time-travel, we are only moving through time, and not through space. So, if we are at a given set of co-ordinates X, Y, Z at the present time A, and we go back in the past to some moment B, we would still, essentially, be at the same co-ordinates XYZ. Now, here's the point. Earth is moving through space; moving with velocities we might not even have a clear idea of. For definite, we know the earth is moving around the sun, the sun is moving around the centre of the galaxy, and the galaxy itself is moving. That makes up a lot of motion. So that at any given two instants earth would be at two different places. So, if i travel in time, whether in past or future, while retaining my location in space, i would end up in empty space, cause earth would be somewhere far far away..." http://awaisaftab.blogspot.com/ What's the guy missing here? I've been thinking for some time and I'd really like to know. Thanks.