Max Talmey, a friend of Albert Einstein’s during his school years, has just published a book to which Professor Einstein has given special commendation because of the lucid manner in which the author ...

Black holes, regions of spacetime in which gravity is so strong that nothing can escape, are intriguing and extensively ...

I. IN continuation of my article in the Relativity Number of NATURE (vol. cvi., p. 795, Feb ruary 17, 1921), I propose to discuss more fully, and to express as clearly and simply as possible, some of ...

When the first-ever image of a black hole was released in April 2019, it marked a powerful confirmation of Albert Einstein’s theory of gravity, or general relativity. The theory not only describes the ...