To Infinity and Beyond: The Accelerating Universe

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Lawrence Kraus is a gem

I wonder how different this talk would be if they had it today... So much happened this year. Great talk, I love this channel!

We know galaxies are receding from each other because as we look farther away they get closer together. The scope of the Universe is unfathomable as it should be. Infinity is so damn hard to see. We will never know what is beyond what we can see no matter how far we look. It's hard to accept but it is also beautiful.

It's interesting watching this after they've discovered gravitational waves.

Priya seems to be a very good explainer, kept everything simple, using easy to understand analogies (potholes, lumps, etc.). The others were good too, but she was especially good. Loved the interactions between Lawrence Krauss and Neil Turok at the end. Even though Krauss was supposedly the impartial moderator of the topic, you could tell he was an equal participant in the topic too, and he and Turok had very different rival theories about Inflation and the Big Bang. Like watching a couple of heavy-weight fighters taking little jabs at each other.

It is amazing how much can change in a short period of time. Based off the discussion of 'No Evidence of Gravitational Waves' @ 43:00, I wonder if there could be a follow up discussion ; not necessarily based off BICEP's observation, but LIGO's findings earlier this year.

Kind of literally light years ahead of TED talks, at least in the study of the universe. Awesome dream fuel.

Funny listening to parts of this now after proving gravitational waves exist..cant imagine what we'll know 10, 20, 50 years from now and think how funny it'll be listening to the things we think we know now

Excellent! A great panel that clearly presented many of the cutting edge ideas in Astronomy. Thanks! Only thing to add. Follow it with deep drill down presentations on each of the major ideas presented.

Now that we've detected gravitational waves could you bring back these guests for an update?

really great introduction!!

Thankyou for this!!!! Wondeful !!!!!!!!

Finally! I was waiting for this video since may!!! Knowledge!!!

the problem mentioned at 27 minutes has a solution. i found the answer. time is negative. Riess suspected a negative sign problem. the negative sign is missing in his calculation. he speeks of the most distance galaxies moving in real time or current time, evenafter he tells us that these most distance galaxies are next to the most ancient parts of the universe. the high red shift of these most distance galaxies, the high expansion rate of this part of the universe has absolutely nothing to do with what the universe is doing today. the acceleration is not increasing but just the opposite. the early universe expanded faster but slowed as the universe ages and the chart shows the redshift tending to the blue edge of the spectrum as time progresses. hence, no dark energy from this perspective.

they've finally posted the whole discussion on here

Interesting watching the battle with the guy at end - wondering what his response is now with the confirmation of gravity waves only a short time after this interview. But I must admit, I do think like him, and agree that the simplest explanation of nature is usually the correct one, and back in 2015, I would have found his explanations most convincing.

I would like to see more of Lawrence Krauss presentations. Love his sense of humor and insights on the latest science topics.

I also wonder what Neil Turok has to say now that gravitational waves have indeed been detected. And - instead of interpreting his statements, I say let them stand on their own. NT didn't say "gravitational waves produced by the big bang or inflation haven't been observed," he said "gravitational waves haven't been observed." NT also implies that because super-symmetric particles and more massive Higgs bosons haven't been discovered in the LHC, they must not exist. But that REALLY only means that they (apparently) don't exist at the energy levels (distances) probed by LHC - NOT that they "don't exist.". "Absence of evidence is NOT evidence of absence..." as one of the panelists said early on. Look - I truly appreciate informed scientific skeptics and rule breakers. Eratosthenes. Copernicus. Kepler. Galileo. Newton. Maxwell. Planck. Bohr. Einstein. Heisenberg. Dirac. Schrodinger. Hubble. (And MANY more...) They ALL abandoned the current scientific dogma of their times and led us to amazing new truths about our universe. And I get that Neil Turok has a "brain the size of a planet!" But he makes many seemingly unfounded assumptions in his explanation of his personal views... If history is truly our guide, the next scientific revolution will likely be far stranger than anything imagined to date - and THAT'S why I love science!

good stuff :)