Because asset realization is the one thing that can justify interstellar flight.

The basic principle I had evolved to get the speed necessary for interstellar flight simply wouldn't work.

The whole procedure was simpler than interstellar flight, once you knew what to do.

As always before, however, he was able to unpack from interstellar flight in only a few minutes.

The Brakiri have had interstellar flight since the Earth year 2111.

No one could even guess how long they had known interstellar flight, or where they had come from.

They're a race of cellular giants which have had interstellar flight since the beginning of our recorded history, some two thousand years ago.

This would have been my last interstellar flight.

In the course of time they had achieved civilization which included interstellar flight and an advanced medical science.

You know why interstellar flight has never been possible.