The new book by Jeffrey Bennett introduces Einstein’s theory of relativity to a lay audience, explaining why black holes don’t suck and other phenomena.

In 1907, Albert Einstein had his “happiest thought” — people in free fall do not feel their own weight. This simple idea laid the foundation for his general theory of relativity, which ...

This is the central consequence of Albert Einstein's special theory of relativity. The object then has a different length than when it is at rest, and time passes differently for the object than ...

Einstein published a new theory of gravity—the theory of general relativity—in 1915. It would transform our understanding of physics forever. But it’s far from perfect.

The answer goes back to the old faithful theory of financial relativity. What this person is neglecting to point out is that their friends were a police officer and a schoolteacher for 25 years.

The answer goes back to the old faithful theory of financial relativity. What this person is neglecting to point out is that their friends were a police officer and a schoolteacher for 25 years.

Why it matters The weak-equivalence principle is integral to general relativity, so these test results offer yet more support for a core theory of our universe.

These are just a few of the questions author and astrophysicist Jeffrey Bennett answers in his new book, "What is Relativity" (Columbia University Press, 2014).

A snapshot of relativistic motion: Special relativity made visible Date: May 5, 2025 Source: Vienna University of Technology Summary: In 1959, physicists James Terrell and Roger Penrose (Nobel ...