"No one" is conversational speech. How much of the rest of the spiel sounds like something you'd hear in a conversation?
"Space: the final frontier. These are the voyages of the starship Enterprise. Its five year mission, to explore strange new worlds, to seek out new life and new civilizations. To boldly go where..."
If you want to use "no one", it should be consistent with the rest.
"Space is the last place to explore. The starship called the Enterprise is making these voyages. Over five years, it's supposed to explore strange new planets, and look for new kinds of life or civilizations we haven't heard of, and look for them where no one else has gone yet."
“Tolerance is the virtue of the man without convictions.” GK Chesteron
Inde muagdhe Aes Sedai misain ye!
Deus Vult!
*MySmiley*