"Let's look upon this as the opening of the international space frontier," Mr. Goldin said.

It includes creating an environment in the space frontier that is routine enough for ordinary people to live, work and recreate.

It successfully challenged teams to build private spaceships capable of carrying three people and fly two times within two weeks to open the space frontier.

"It would transform the space frontier of the 1970s into familiar territory," said Nixon, "easily accessible for human endeavor of the 1980s and 1990s."

Medical technology, the space frontier, advanced computers, and new social inventions all promise to play interlocking roles.

In the future, an open space frontier will widen the human world.

By adapting present technology, we could open the space frontier.

The promise of the space frontier can thus mobilize human hope - a resource we will need in abundance, if we are to deal with other problems.

He's the scholar who helped me understand the real meaning of the space frontier.

In this second phase, the abundant resources of the space frontier will end any need for the strict regimentation of the original Plan.