If expansion only occurs where matter exists (I seem to remember some hypothesis along those lines), then theoretically the universe could expand like a sea urchin, and what we see is the center and things that are moving in our general direction, but we wouldn't see the stars that are in a different "spike", so to speak, because between us and them is...well...nothing, in the sense that there is no universe or space there.
ἡ δὲ κἀκ τριῶν τρυπημάτων ἐργαζομένη ἐνεκάλει τῇ φύσει, δυσφορουμένη, ὅτι δὴ μὴ καὶ τοὺς τιτθοὺς αὐτῇ εὐρύτερον ἢ νῦν εἰσι τρυπώη, ὅπως καὶ ἄλλην ἐνταῦθα μίξιν ἐπιτεχνᾶσθαι δυνατὴ εἴη. – Procopius
Ummaka qinnassa nīk!
*MySmiley*