The Earth's Moon is much more suitable than Mars for an off-world colony. The Moon is much closer, and this plus its low gravity facilitates transport between Earth and Moon. The unfavorable lunar surface conditions are negated by living underground. With energy provided by nuclear and solar energy, and employing complete recycling, the Moon Base Colony is successful.

In the author's opinion, such a Moon based colony is practical now.

This book describes such a colony of humans on the Moon. It follows the technological, social, physical and psychological changes brought about by living on the Moon for 10 centuries/20 generations..After 20 generations humans have adapted to the Moon's much lower gravity, and the necessity of living underground under crowded lunar conditions, to the extent that they look very different from the early settlers. But they are still human beings.

Persons interested in the subjects of colonizing off world, and the future of humanity in space when these worlds are colonised, will enjoy reading this book.