This second edition to the bestselling Quantum Gravity in a Nutshell1 is a good introduction to quantum gravity and has a lot of interesting history about the development of the theory since 1899.
Objects in the Universe are subject to the continued actions of forces (accelerations) because of rotation, translation, electromagnetic, and gravitational interactions with nearby and distant surrounding bodies.
The current understanding of space and gravity is based on Albert Einstein's general theory of relativity, which incorporates his theory of special relativity and deeply modifies the understanding of concepts like time and space.
In the Holy Grail of modern physics , theoretical physicist Balungi Francis provocatively argues that the problems which have bedeviled quantum physics since its inception are due to Bohr's wrong solution to the Larmor theory.