The mind-bending physics of time | Sean Carroll

Watch our full interview, "The Universe in 90 Minutes," with Sean Carroll: https://www.youtube.com/watch?v=tM4sLmt1Ui8

Sean Carrol is so articulate and masterful at summarizing big concepts to the laymen. His Mindscape podcast is a true gem.

I heard a really good time travel joke tomorrow.

You make such lucid, clean, and clear videos. Your pacing, content, and imagery are pitch-perfect. Thank you.

I am a teacher and I tried to explain Time to them but they asked so many questions I ran out of time and the bell rang! Then, as they walked out, they got it!

I understood entropy so easy when he talks...if I had a teacher like him in school...I would loved to learn more.

I love your explanation, Sean Carroll. It is a keeper. Personally, I am making difference between time and timing. While time is immeasurable, timing is within a measurable scope.

What I love about this video is how interdisciplinary it is. From starting with linguistics and breaking down the definition of time, to describing the sociological notions of time, shows how all these modes of studying offer some part of the puzzle that is understanding our universe. I was particularly awestruck by the perfume analogy, which I argue to be a poem. Utilising such a beautiful example to describe the nature of our world made me tear up, again emphasising the importance of literature and creativity in asking questions about our existence!!! Wonderful!!

i could listen to him talk forever. it's so fascinating and intellectually stimulating, yet easy to understand.

It amazes me how Sean Caroll can talk about such profound topics in such a clear way

These videos are so well made.

I had a question very related to this a few weeks ago: "How could life have come about if the entropy of a system has to increase?" The answer I found is that the entropy of a part of a system can decrease or stay the same if the entropy of a whole system continues to increase. And life, really, as he said, is a system that feeds off of entropy, we are fine tuned by the edge of evolution to adapt to change and to overcome it, in a reasonably stable solar system with a constant source of energy and somewhat constant conditions.

This video is a fascinating exploration of the interconnectedness of time and entropy. Sean Carroll does an excellent job of breaking down complex concepts and presenting them in a way that's accessible and thought-provoking. The idea that time is merely a label we use to distinguish events is mind-boggling, and the discussion on the arrow of time and its connection to the Big Bang is truly intriguing. I appreciate Carroll's challenge to the notion that life is a fight against increasing entropy, emphasizing that life actually owes its existence to the increase in entropy. It's a fresh perspective that opens up new possibilities for understanding the emergence of complexity in the universe. Overall, this video has sparked my curiosity and left me with a lot to ponder.

Big think professional editing+sean carroll brilliant presentation= an absolute masterpiece

I don't have time to watch this.

Thank you for a lovely overview of time and why life needs entropy. Folks forget that much as a mill needs flowing water for energy, life needs the flow of entropy to build complexity. 2:26 "There's no special direction in space." The more precise statement is that the universe kindly keeps all options open until we choose a direction of motion. Leaving our rest frame blends space and time in that direction, making the target distant not just in space but also in time. At close to lightspeed, the distance becomes almost purely one of time. Your particularly zippy spaceship might see only a few kilometers of Lorentz-compressed distance in its trip to the Andromeda galaxy, but in that brief trip, you see 5 million years of Andromeda time unfold. (If you heard Andromeda freezes in time during your trip, sorry, that's just not what happens. Age gradients are as much a part of Lorentz contraction as the contraction itself; the two are inseparable.) Incidentally, the pre-acceleration openness of options we call space is possible only in systems containing particles or particle systems with rest mass, which means particles that bind chiralities via the Higgs mechanism of particle physics. It is a profound error to think that time and particle physics are separable components of physics. Entropy plays a vast role in time, but particle physics first makes space and entropy meaningful. (For a CC BY 4.0 PDF copy of this 2023-01-29 comment, see sarxiv dot org slash apa)

Time is our abstract explanation of change. It is our illusion.

Best Teacher Sean Carroll.

Also — with the expansion of spacetime — is the entropy of the universe REALLY increasing? Is the expansion itself a byproduct of increasing entropy? Perhaps space, as a medium, can only accommodate so much entropy per unit of “density” and expands elastically when more entropy is dumped into it?

Sean Carroll's mind takes flight, Unraveling time's mysteries, day and night. Physics' dance, a mesmerizing show, With each tick and tock, new insights we'll know.