2. Time and space are neither flat nor fixed; they are curved and distorted by mass and energy. Gravity is not a force, but rather a distortion of time and space. Their main motivation is to explain the latest cosmological and astrophysical data on dark energy and dark matter. And his equations implied … Einstein's theory of gravity cannot account for everything in our universe So scientists have speculated that an invisible 'dark matter' exists to … Introduction In the last few years modified gravity theories have been proposed as extensions of Einstein's theory of gravity. 3. The main takeaways behind Einstein’s general theory of relativity: 1. Einstein’s theory explained a famous observation that Newtonian gravity could not: a subtlety in the orbit of the planet Mercury.