Uploaded March 2026 | Updated September 2026, 5 hours ago
What if the Big Bang wasn’t the beginning?
In this episode of our multiverse series, we examine one of the most ambitious and controversial ideas in modern cosmology: Roger Penrose’s Conformal Cyclic Cosmology (CCC). This theory proposes that our universe is not the first, and not the only one. Instead, it may be just one cycle in an endless sequence of universes, where the remote future of one universe becomes the Big Bang of the next.
But how could an infinitely large, cold, and empty universe give rise to a new beginning? And how could the universe reset from a high-entropy state to the extraordinarily ordered conditions of the Big Bang?
In this video, we explain CCC step by step, including:
• How Penrose identifies the infinitely large with the infinitely small through conformal invariance
• Why the theory requires all mass in the universe to eventually disappear
• How the loss of mass would cause time itself to lose meaning
• The role of black holes and Hawking radiation in resetting entropy
• Why most physicists reject key assumptions of the theory
Penrose famously calculated that the initial conditions of our universe are extraordinarily unlikely, on the order of 1 in 10^(10^123). Conformal Cyclic Cosmology is his attempt to explain this without appealing to a multiverse or an intelligent cause.
We conclude by evaluating whether CCC succeeds, and what its challenges reveal about the difficulty of explaining the origin of the universe.
This episode is the final installment in Season 2: The Case Against the Multiverse, where we examine the leading scientific theories proposed to explain the structure and origin of the universe without design.
For more, see physicstogod.com
What if the Big Bang wasn’t the beginning?
In this episode of our multiverse series, we examine one of the most ambitious and controversial ideas in modern cosmology: Roger Penrose’s Conformal Cyclic Cosmology (CCC). This theory proposes that our universe is not the first, and not the only one. Instead, it may be just one cycle in an endless sequence of universes, where the remote future of one universe becomes the Big Bang of the next.
But how could an infinitely large, cold, and empty universe give rise to a new beginning? And how could the universe reset from a high-entropy state to the extraordinarily ordered conditions of the Big Bang?
In this video, we explain CCC step by step, including:
• How Penrose identifies the infinitely large with the infinitely small through conformal invariance
• Why the theory requires all mass in the universe to eventually disappear
• How the loss of mass would cause time itself to lose meaning
• The role of black holes and Hawking radiation in resetting entropy
• Why most physicists reject key assumptions of the theory
Penrose famously calculated that the initial conditions of our universe are extraordinarily unlikely, on the order of 1 in 10^(10^123). Conformal Cyclic Cosmology is his attempt to explain this without appealing to a multiverse or an intelligent cause.
We conclude by evaluating whether CCC succeeds, and what its challenges reveal about the difficulty of explaining the origin of the universe.
This episode is the final installment in Season 2: The Case Against the Multiverse, where we examine the leading scientific theories proposed to explain the structure and origin of the universe without design.
For more, see physicstogod.com
