Gravity is the assumption of a spinning globe earth that requires the center of alleged globe to have a particle magnet in the middle of it.
--Dave
"Particle magnet?" Seriously? Dave, I'm pretty darn sure you don't have a particle magnet in you. It's not just large objects that have gravity, ALL OBJECTS that have mass, including you yourself, attract objects to each other. The only reason you don't notice it is that it take A LOT OF MASS for that attraction to be strong enough to overcome other forces.
And no, it's not the "assumption" of anything, it's a PROPERTY OF MATTER. If it has matter, it has gravity.