Sometime when you setup your scene in Blender and zoom the camera out in the distance, you will notice your object disappear. The is called camera clipping, it is to help speed Blender viewport performance without having to use processing power or memory to display every objects in the distance. Follow the basic steps below to resolve your camera clipping.
Make sure you are viewing your scene from the camera Ctrl Numpad 0. Click on the camera properties tab on right panel.Under Lens you see a Clip Start and End field. Change the End field to a higher number. eg. Default is 100m, can be changed to [...]