I have heard of these types of ships though, and they're not alive. They are a nuts and bolts mechanism, but the mechanism within it is a time-space portal, a portable portal, that can project the craft to any point in time-space. That's all that I know about them. It's your turn Helana. Helana continues I have heard of them too. They are very interesting. The projection into time-space can be anywhere in space, and anywhere in time. A lot of the mechanism, computer like things, calculate the stability of the projected destination to account for rotating planets, solar orbits, celestial movement, time domain fluctuations, etc. It even has to account for time itself as these portals can project into the past or the future. The visitation to our planet can be from what, from our perspective, is the distant past or distant future.