I could really go on about this genre (and I had planned to), but familial obligations keep me from doing overly much. Instead, I will just give you some of my many, many favorites that came to mind.
Hitchhiker's Guide to the Galaxy by Douglas Adams
Dune by Frank Herbert
The Cat Who Walked Through Walls by Robert A. Heinlein
Podkayne of Mars by Robert A. Heinlein
I am Legend by Richard Matheson
Acorna by Anne McCaffrey
Keeper of the Universe by Louise Lawrence
The Road to Mars by Eric Idle
Across the Universe by Beth Revis
The Fall of Angels by L. E. Modesitt, Jr.
As with yesterday, I will return/reply/whatever when things settle down over here. Meanwhile, be sure to go enter my giveaway as a part of the Showers of Books Giveaway Hop.