Ancient Detiny Vol III - Generations

The women come into their own establishing space colonies.  The colonies are expanding and developing new technology as they recreate Earth on three separate planets.  Exploration continues.  Craig and his six woman crew discover some ancient planets that were partially destroyed then abandoned.  Was it war?  Was it a flaw in their technology that made the planets uninhabitable.  As they search for answers they find an enemy that they must defend the colonies against and find a way to turn the tables to a more advanced civilization.  They must develop new space weaponry to defend the colonies.  Some of the crew must be replaced.  They discover that there were a few survivors on Earth, but do not know how to help them.  Their fledgling colonies do not have the industry to build more space colony ships.