Im having a hard time rendering my scene. Only one object (a spaceship) in the scene shows up in my IPR window. The terrain and sky I have in my scene do not show up.

I added some lights, and everything is well illuminated when I press seven on my keyboard. Still only the space ship shows up. I batch rendered the scene, and only the spaceship showed up in my final movie.

Does anyone have any suggestions on how I can solve this problem?