About this "planet" idea: Most of us swear up and down that there is an actual, physical LOCATION called "Heaven". We swear God and Jesus are both sitting on an actual throne there. We even believe the physical description of the place, streets paved with gold, and all that. Some of us also actually swear that God has either already built a brick and mortar city there (New Jerusalem), or He is going to.
So where do we get off blasting the Mormons for understanding that same LOCATION as simply being another planet, similar to the one we also now live on? They just happen to call it Kolob. And they don't really think that is God's private home. They just think it is close to where the throne is.