Cycles of Time: An Extraordinary New View of the Universe is a science book by mathematical physicist Roger Penrose published by The Bodley Head in 2010.

Penrose cites concentric rings found in the WMAP cosmic microwave background survey as preliminary evidence for his model, as he predicted black hole collisions from the previous aeon would leave such structures due to ripples of gravitational waves.

Most nonexpert critics (nonscientists) have found the book a challenge to fully comprehend; a few such as Kirkus Reviews[2] and Doug Johnstone for The Scotsman[3] appreciate the against the grain innovative ideas Penrose puts forth.

Manjit Kumar reviewing for The Guardian admires the Russian doll geometry play of the CCC concept, framing it as an idea of which M. C. Escher "would have approved".

[5] The American fiction writer Anthony Doerr in The Boston Globe writes "Penrose has never shied away from including mathematics in his texts, and kudos to his publisher for honoring that wish.