All that was left of a mighty civilization.

How long and at what cost had the ancients striven to the final achievement of their mighty civilization!

Beyond these few scraps, we have very little about the race whose mighty civilisation thronged this world for more than a million years.

As a result of their wanton acts of destruction throughout the universe, energy was released from what were once mighty civilizations.

Captain, that's the explanation for everything: these eleven million creatures must be the degenerated remnants of the mighty civilization that built all this technology.

Only a mighty civilization could have built this!

Millions of years, millions of years to build up a mighty mental civilization.

"Where there doubtless will one day exist a sophisticated and mighty civilization, with powers I can only dimly imagine."

What was it that brought this glittering and mighty civilisation to an end?

But on one of the stars above, called Mars, were people who knew a mighty civilization and a vast world of science.