With your permission, I want to start work on the first interplanetary ship.

Last week a fellow asked me if there'd ever be interplanetary ships again.

We only need one normal-space interplanetary ship to get there, and we're in business.

"There are a couple of other companies interested in interplanetary ships now," his father added.

They must know they've got interplanetary ships, not interstellar colony craft.

But making it happen moment by moment is both craft and art, especially while using a new class of interplanetary ship.

"You were able to take an interplanetary ship and turn it into an interstellar vessel?"

On some colony worlds interplanetary ships are built and manned.

"I imagine you would like to live to spend that money in your pocket, so I've booked us two seats on an interplanetary ship."

"They travel in an interplanetary ship and their home must be somewhere in this system."