We use the change from formless to formed, the appearance of the orientation under and above, and the analogy of a drawing compass having a focus and circumference to deduce that gravity was created on the second day.
A corollary is a statement that follows readily from a previous statement.
We (that's me and the Holy spirit) found gravity in the context of the second day of creation, by which God establishes a space between the waters above and the waters below the firmament.
The core accretion model is an example of a self-evident truth. It's obvious that the Earth formed as sediment accumulated around the core. Now we have a theory of gravitation derived from scripture.
The concept of sinking down occurs in the creation narrative when God laid the foundations of the earth. The occurrences of this phrase fit the creation of a gravitational singularity on the second day.
David and Goliath, and the role of gravity in the story, illustrate the fact that we’ve destroyed the theoretical foundation of mainstream science (SciPop).