Every star system she could see, and more, now lay within the range of human exploration.

And in two weeks we begin a whole new phase of human exploration.

Early human exploration had always been motivated by the search for new land.

Its only real value is to gain experience and knowledge needed for human exploration of the solar system.

He has also contributed to plans for the human exploration of Mars.

A space station is also unnecessary for human exploration of the Moon.

This also motivates him to attempt to end all human exploration of space.

A space station is a stepping stone for human exploration of the solar system.

This mission will include collecting scientific data important to future human exploration of our solar system.

The human exploration of Mars presents a massive engineering challenge.