How to prove Einstein’s relativity for less than $100 Although there are four major types of particles that can be detected in a cloud chamber, the long and straight tracks are the cosmic ray muons, which can be used to prove that special relativity is correct. Image credit: Wikimedia Commons user Cloudylabs.
Special Relativity: A Heuristic Approach (Paperback)
Albert Einstein's equation for the General Theory of Relativity, on a red background. General relativity generalises special relativity and Newton's law of universal gravitation, providing a unified description of gravity as a geometric property of space and time, or spacetime.