What it argues
Carlo Rovelli, a theoretical physicist best known for his work on loop quantum gravity, wrote this book originally as a series of essays for an Italian Sunday newspaper. It became an international bestseller, largely because Rovelli writes about physics with a literary sensibility that is unusual in popular science. The book is not a comprehensive introduction to modern physics. It is something more like a love letter to it: seven short meditations on seven ideas that together define the current state of understanding about the universe.
The first lesson covers Einstein's general theory of relativity, which Rovelli calls the most beautiful theory in all of science. Space is not a rigid container but a dynamic field that curves in response to mass. Time passes faster away from massive objects and slower near them. Gravity is not a force but the shape of spacetime. Rovelli conveys why physicists find this beautiful, not just correct.
What it gets right
- 1.
General relativity describes gravity not as a force but as the curvature of spacetime caused by mass. Einstein derived it almost entirely from the requirement of mathematical beauty.
- 2.
Quantum mechanics describes a world that is fundamentally granular, probabilistic, and entangled. It is the most precisely confirmed theory in science.
- 3.
The two great theories of modern physics — general relativity and quantum mechanics — are mathematically incompatible. Reconciling them is the central unsolved problem in physics.
What it covers
Who wrote it
Carlo Rovelli is an Italian theoretical physicist and professor at Aix-Marseille University, best known for his contributions to loop quantum gravity, an approach to reconciling general relativity with quantum mechanics. He is the author of several popular science books including The Order of Time and Reality Is Not What It Seems. Rovelli is unusual among working physicists for writing with genuine literary quality: his books engage questions of philosophy, time, and human meaning alongside technical physics, and have sold widely across Europe, North America, and Asia.