For my first puzzle here, something short and simple. Well, short.
My first is a space.
My second leads to a space.
My whole is in space.
What am I?
Hint 1:
The answer is a single word.
Hint 2:
The answer is fictional.
Hint 3:
The first is something you can(not) see, the second is something you can(not) hold, and the whole is somewhere you can(not) go.