[zeroca]

Hi, Michelle.
I’m not scientist, as you know, so I will express my humble opinion without complex, freely, if you don’t mind.
Generally there are two basic different opinions about gravity:
---It’s attraction between two bodies according to the formula f=γMm/r2
where γ is gravitational constant, M and m masses of objects, and r distance between them.
---I assert that the gravity is striving of matter to the center, i.e. it isn't attraction, but it is concentration of matter to some center (for example: the matter placed within “gravitational field” of Earth is striving to the center of Earth, but the matter placed within “gravitational field” of Moon – to the center of Moon, but that doesn’t mean that the Moon is attracted by Earth and vice-versa).
---I believe that the space is anti-gravity (you can call it - levity) and assert that all bodies have their own spaces, but when bodies are united, their adjacent spaces do the same, i.e. everything that is placed within the “gravitational field” of Earth, has common space, which begins from the center of the Earth and spreads up to some distance spherically. Space has direction, Space makes the solid matter, placed within its bounds to concentrate centrally, but attracts the matter, placed outside its bounds (for inst., the space, adjacent to the Moon attracts the matter of Earth, but the space adjacent to the Earth attracts the matter of the Moon).
The matter itself can be in two different forms: 1.contracted and 2.expended:
Mass is the main characteristic feature of the first,
Speed is the main characteristic feature of the second;
Correlation between the mass and the speed of any separate amount of matter is following:
m~1/c, or m~1/c2, but mass is inverse proportionally to speed, i.e. when any separate amount of matter (i.e. separate amount of matter without outer influence) loses mass, it gains speed, and vice-versa. The ultimate form of solid state is solid matter after ending of free fall (i.e. at relative rest); the ultimate form of speed is speed of light:
I.e. Not even any object can move with a speed of light and have mass at the same time.
When the matter is in expanded state, it strives from the center of planet in opposite direction, but as for light (it is highest possible speed, i.e. “quickest” spreading of expended matter), i.e. it can spread equally in any direction without obstruction, i.e. freely occupy any part of “empty space” in any direction.
For visual effect see below:
1.The first animation- "At the beginning of the world in case of two bodies"
---The direction of space is shown with blue arrows
---The direction of contraction (concentration of matter) is shown with gray arrows.

2. The second animation - When the process of forming of universe is complete, we got planets with adjacent to them spaces and the matter strives just to the center of planet, in the area of adjacent space of which it is located.

---Little pebbles - direction of striving of contracted matter: free fall (gravity).
---The blue clouds – direction of striving of expanded matter: free rise (levity).