Most of the space between the firmament and Earth is the cosmos or observable universe. There's something very odd about the cosmos: there's a disconnect between what we can see vs. what we believe about it.
The Second Heaven
If it Looks Like a Galaxy
Galaxies, in terms of the scientific definition, don't exist. The things that we call galaxies are ULM (unknown luminous matter), which consists of predominantly CFM (crystalline firmament material).
Experimentation for Synonymy
Most people believe that the heliocentric theory disproves Geocentrosphericity. The fact is that heliocentric and geocentrospheric are two different frames of reference in the same system. They coexist.
Rubies and Sapphires
If there are football field-sized and larger pieces of ruby and sapphire in the Kuiper belt (crystalline firmament material), then we should see light spectra consistent with ruby and sapphire.
Hypothesis 30
The measurements of starlight we take don't tell us if the light is reflected or emitted by the stellar bodies, that's one of the leaps of faith in the mainstream science paradigm (SciPop).
Rolled Together as a Scroll
Is the phrase "the heavens shall be rolled together as a scroll" flowery poetic language or accurate physics? If the firmament is a rigid sphere of crystal on the edge of space, it's accurate physics.
The Geometry of Despair
Measurable parallax would be proof that the Earth isn't at the center of God's creation in which case the issue of whether or not God created it has new significance. Unfortunately Galileo couldn't find any parallax.
Measure the Heavens
We start with a simple observation: God hasn't, and won't, cast off the seed of Israel. This leads us to a conclusion: We haven't measured the heavens. So why do we think that we know the distance to the sun and its mass?