My apologies for the delayed response. Here's how I understand things....
All of my conclusions are based off of empirical evidence and the scientific method. I can look up and verify through my senses and critical reasoning that that the stars, moon and sun exist. I make no claim to their nature nor composure. They are luminaries that rotate above our plane....believing anything else, well that is by definition, dogmatic. In fact, the entire premise behind the heliocentric model and globular bodies of matter firmly depends on religious beliefs and pseudoscience. To answer the latter part of your post, I do not claim to know anything about our Earth other than what is observable, measurable, and repeatable. The depth, vastness, what lies beyond or outside of the firmament is anyone's guess. What has never been scientifically proven in regards to earth are curvature, motion and an atmosphere without a container, all of which are disproven using physics, fluid and thermodynamics.