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Torillian said:

I do wonder about what causes gravity. Most of what we know is just that it definitely exists and the trends with which it increases and decreases dependent on mass and distance between the objects.

Its not mass that is attracted to each other, energy is also acted upon by gravity.  It has been proven that light is bent by gravity (Einstien), which is why we can see objects behind the sun and why black holes are black.  Also, the flow of time changes with regards to gravity.  An astronaut who spent some time in space has experienced a few more seconds than people on Earth, and physicists theorize that time slows to a crawl around black holes.

Gravity is energy acting on spacetime.