Gravity Simply Explained

Gravity is everywhere. It keeps our feet on the ground, guides the Moon around the Earth, holds the planets in orbit, shapes stars and galaxies, and influences the evolution of the universe itself. Yet gravity remains one of the deepest mysteries in modern science. In Gravity Simply Explained: From Falling Apples to Curved Spacetime, Peter I. Kattan takes readers on an accessible journey through humanity's changing understanding of gravity-from the early ideas of Aristotle and the experiments of Galileo to Newton's law of universal gravitation and Einstein's revolutionary description of gravity as the curvature of spacetime.

Written for beginning university students, engineers, teachers, and curious general readers, this book explains the essential ideas with clear language and only the mathematics needed to understand the physics. Readers explore planetary motion, orbital mechanics, escape velocity, gravitational energy, relativity, black holes, gravitational waves, dark matter, dark energy, quantum gravity, and the practical role of gravity in engineering, GPS navigation, satellites, geophysics, and space exploration. Exercises, solutions, a historical timeline, and a glossary reinforce the key concepts. Gravity Simply Explained shows how the same phenomenon that makes an apple fall also governs planets, stars, galaxies-and perhaps some of the greatest unanswered questions about the universe.