Is gravity a result of mass or size?
When I was in highschool, we were taught that gravitational force was a result of ridiculous amounts of mass. Like the sun. That high mass meant higher gravitational pull.
But then, I started learning about space time (which I don't fully grasp yet, to be honest)... I learned that gravity is a function of curves or dips in the surface of space time, and that objects in a gravitational field are really just circling around the toilet bowl of a very large piece of whatever.
The issue is, wouldn't that mean that gravity is a result of SIZE (as in, how great a dip it makes in space-time) as opposed to MASS?
Any resources to help me understand would be GREATLY appreciated.