Roger Penrose: Time, Black Holes, and the Cosmos

Nobel Laureate Roger Penrose joins Brian Greene to explore some of his most iconic insights into the nature of time, black holes, and cosmological evolution.

Moderator: Brian Greene
Participant: Sir Roger Penrose

00:00 - Introduction
00:49 - Participant Introduction
02:02 - A Working Definition of Time
07:25 - Applying Entropy and The Second Law to the Directionality of Time
16:37 - What The Early Universe May Have Looked Like
20:27 - Solving the Puzzle of The Past Hypothesis
31:46 - Investigating Exponential Expansion
38:50 - New Discoveries and Discourse Since 2004
55:41 - A Peek Into Sir Roger Penrose’s Continuing Research
01:08:17 - Credits

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[rachel_rexxx]

I'm impressed by his coherence at 93. We should all hope to be so lucky.

[Kronzik]

Roger Penrose is one of the greatest human minds to ever exist and a personal hero of mine. Thank you Brian and Sir Roger for bringing this conversation to us!

[hugegamer]

I’ll never forget watching Roger Penrose speak in person at University, he has always been a very eloquent speaker.

[thomasreisman]

As an old person myself it's a delight to see someone with such a young, active, creative mind.

[ClayFarrisNaff]

What an extraordinary privilege it is to be able to hear a conversation between a Nobel laureate who not only continues to explore the frontiers of knowledge but does so in unconventional, not to say eccentric, ways, and an accomplished, seasoned theoretical physicist who is also one of the great science communicators of our time. It's fascinating to glimpse and even to feel the tensions in the physics community, and at the same time to appreciate how much confirmed and shared knowledge we have gained. I'm enlightened; I'm uplifted; and I'm grateful. Thank you both.

[SANGI]

It’s honestly incredible how well Penrose can explain a concept at his age! Unreal human being.

[chinookvalley]

I miss my dad. Roger reminds me so much of him. Dad died with a brilliant mind at the age of 91, only because he wanted to be with his wife of 65 years. RIP mom and dad.

[junkgyre]

I COULD LISTEN TO PENROSE RAMBLE ALL DAY.

[anthonyfiolet]

I don't know why but listening to this man makes me feel good

[mountjlswgoh]

What I love about this discussion is that it epitomises what science is all about. Sir Roger has his perspective. Alan Guth has a contrary perspective. And neither throws their toys out of the pram about the others' perspective. Progressing knowledge by cordial argument, but neither being unwaveringly steadfast (or obstinate, if you will) that their opinion is unequivocally correct. I love it.

[helisoma]

put simply this discourse with Dr. Penrose and how Brian tries to elucidate it in depth is no less than a gift to humanity for the ages, and years from now i hope Dr. Penrose model will be appreciated and accepted for the brilliance that it represents

[andrewsarchus]

Reading The Emperor's New Mind as a young man caused me to go back to Uni and study physics. Prof Penrose directly changed my life for the better and he will always be my Prof.

[GunnarRósarsson]

I'm 68 right now. Feel like I'm 8, listening to these guys. When I grow up I wanna be like Dr. Penrose.

[mahmoudmassoud]

Kudos to Professor Brian Greene who masterfully conducted this fascinating conversation with Professor Roger Penrose.

[jHjSquad]

Roger Penrose: 35:30 Well I have to be slightly technical here...
Me: *buckling up*

[baseshorts]

Roger Penrose ability to describe physics, cosmos and mathematics is impressive! He is the greatest mind of our time and Im glad we live in his area!

[tinytim]

Sir Roger Penrose! 🫡. Love his demeanor. Never condescending. Always brilliant.

[lipgloss]

I love listening to Penrose explaining things.

[TheAnalogRebellion]

Every interview with Roger Penrose is a treasure. I'm grateful he does so many. Thank you!!

[mediocre.climber]

Awe inspiring that this man at 90+ is still working on the hardest questions we currently have.