Across cosmic distances, though, past and future have little meaning. When they are here they are here now, as now is the only time we can experience. When the visiting beings enter the craft they are both on their home planet, or ship, and here at the same time. So when one of us enters the craft we are both here and there at the same time too. That is why looking out the window is so messed up, showing many places in space and time all mixed up. That's about all I know, but if you're trying to catch one, you won't. They are both here and not here at the same time so it's like trying to reach out and grab an item from a dream. All you will get is air. Sorry, but these ships will remain elusive.