A century hence your grandchildren or great-grandchildren could be leading a blissful life in perpetual sushine in a home among the stars.

They would live with 10,000 others, a huge habitat, or colony, floating in space some 350,000 km (240,000 miles) from the earth at an equal distance from the moon.

The metal and glass used to build the space habitat would have been................... from the ores on the moon.

The population would be self-contained en...............