Simple Thought Experiment Shows Why We Need Quantum Gravity
&quot;General Relativity describes gravity perfectly everywhere we&#x27;ve ever looked. From the smallest-scale attractions we&#x27;ve ever measured in a laboratory to the expansion and curvature of space due to Earth, the Sun, black holes, galaxies, or the entire Universe, our observations and measurements have never deviated from what we&#x27;ve observed. &quot;<p>So correct me if I&#x27;m wrong, but the rotation of galaxies completely defies even Newtonian principles, right?<p>So we invented concepts of Dark Matter &#x2F; Dark Energy as a placeholder, crossing our fingers that we&#x27;re right on that?