1.   This affords Brown a chance to explore the planet which he believes not to be as dead as it first appears.

2.   As the leader of any given faction, you explore the planet, build cities, conduct research and confront other groups.

3.   Cernan said he is disappointed that no other Americans have explored other planets, but he said he has confidence that it will happen eventually.

4.   Galileo, launched six years ago, is the only spacecraft now actively exploring a planet.

5.   Once there, astronauts would use gasses in the Martian atmosphere to power a rover vehicle, which they would use to explore the planet, Zubrin said.

6.   The disaster marked the second failed Mars mission in a row, making some wonder whether NASA was jinxed in its endeavors to explore the planet.

7.   We spend an awful lot of time, energy and money on how to explore other planets and peek at solar systems.

8.   While exploring the planet, the crew of the Enterprise senses itself becoming rejuvenated.

9.   Its Sojourner rover has been exploring the planet and sending back photos and data for analysis.

10.   That decision angered scientists and led NASA to seek proposals for innovative ways to explore the planet at about one-third that cost.