Can someone please help me

I am very new to blender and I have a problem. I rendered and saved my animation, then I changed a few small things to make it better. Now I can’t see anything from the render window when I push f-12. All I see is stars ( My background). I tried to change the settings around but nothing. I can’t see any of my objects at all and I didn’t change anything but a couple of objects around.

Maybe you accidentally changed the visible layer. Try pressing the ~ key (next to the 1). That makes all the layers visible.

Zerg is probably right. Can you see the objects in 3D view? Make sure that Do Sequence and Do Composite are NOT turned on.