The unknown ship had perhaps belonged to the Swifts' space friends!

Important to get a report on the presumed course of the unknown ship.

I must be something he cannot estimate, like the unknown ship we faced.

An unknown ship of great size entered our system over three hours ago, and it has made full orbit.

Masters complied, and quickly the unknown ship changed course in response.

Yet this unknown ship had suddenly appeared and started to fire on the colony.

The unknown ship reversed course and attempts to contact her failed.

Were you able to tell from the shape of the unknown ship whom we're dealing with?

"How many comets is that unknown ship pushing in front of them?"

He arrived in Plymouth between 1628 and 1632 on an unknown ship.