I have studied physics in high school and like to watch documentaries. I was intrigued with Einstein's concept of gravity and I had this question. I may not be precise asking this question, but I hope you will pay more attention towards intention behind this question rather than my inability to ask question in technical terms.
In the world of Newton, the gravity is an inherent property that is exhibited by the objects. But unlike Newton, Einstein's notion of gravity is of time-space. Where due to object the space bends.
So, my question is,
What is the critical mass required to observe the bending of the space?
My personal rationale behind this question is to know that, if space behinds irrespective of how small mass may be or it stops bending after certain critical mass. If so, then there is no point on working on unification theory using Quantum Mechanics and Relativity.
Can we calculate the curvature near classical objects?