Hibernation will open up all the planets to manned exploration.

There is, however, an obvious way to slash the costs and bring Mars within reach of early manned exploration.

And it urges that manned exploration be held within available funds.

"Certainly, the ambitious plans for manned exploration are on hold for the time being," he said.

It is expected that manned exploration of the Moon and Mars will occur within the next two decades.

China has indicated a willingness to cooperate further with other countries on manned exploration.

The Rover, he said, should be the first step toward a manned exploration of Mars.

In Rocheworld, a small group of civilian and military personnel crew humanity's first manned exploration of another star system.

It included almost no new programs beyond his call for manned exploration of Mars.

Moon shot or moonshot is slang for a space program aimed at manned exploration of the Earth's moon.