Nice talk, very well presented. He is engaging, even without slides which some viewers have been asking for.

Very warm heart warming friendly introduction

Interesting lecture with enough levity to keep the listener engaged while talking about a deep subject! Spot on facts also, very well done!

@ossiedunstan4419

Жыл бұрын

Maybe for some with any knowledge of physics, to me it was like sitting through a roman catholic christmas hym. BORING

Enjoyed the talk. Reminded me of a Spalding Gray monologue.

Very interesting and entertaining for the layman.

Took his course long ago when he was at the University of Michigan. Great course. Fantastic lecturer.

I subscribed just to hear Fracnoi talk.

Thank you for a great talk.

Einstein's mistake was, as Planck also demonstrated, a really good "fit" for a problem.

Wow, really fascinating! I just wonder, does this change any notion we have on entropy?

There is another interpretation of the observations of the expansion of the universe. Firstly you use the CMBR rest frame reference to show that we are approximately 26 million light years from the center of a finite universe. Then from this point of observation, the variation in the expansion of space is by distance from the center of the universe and not a variation over time. www.academia.edu/5009126/The_evolution_of_the_universe This paper shows that there is no need for a cosmological constant or inflation and dark energy and dark matter are explained. Richard

Can time dilation cause a shift in light frequency... if so at which point does it do so... on creation of the light or as it moves along because I'm very sure that time moved at a different pace in the earlier universe

The Sagnac experiment indeed proves that the speed of light is not invariant c. The relativistic derivation produced to show that the Sagnac effect is in fact relativistic is nothing but a crafty mathematical trick. Houdini method.

Amazing talk! good to hear him after reading 'The Extravagant Universe'

Its amazing to me that the rate of expansion of knowledge is not a source of concern. That the integrity of society which cannot reconcile run away expansion with fixed earth bound resources worries many but not enough to impact on policy and behaviour. Or as I as teacher often say, for an intelligent species we are incredibly stupid.

Red shift gives a expansion and Blue shift a compression in between this the red shift force is more than blue shift force.

Acceleration and deceleration measure orbits. Is the universe orbiting something?

Redshift is not correctly understood, check out Halton Arp's work.

If the universe is expanding at an accelerating speed, does that mean that all galaxies and all planets moving away from each other? If so at what speed, by how much would that increase the distance between earth and mars in a year. Also would it not make space-travel invalid?

@TheKres7787

6 жыл бұрын

nop only objects outside of galaxies are moving apart. Galaxies themselves have plenty of gravity to keep everything within em immune to expansion.

Albert would never use the term "we know".

Great talk! Very very capable lecturer! You can often see a scientist good in his field but pretty lame when it goes for presenting ideas to the audience - this is not the case! Dr. Kirshner, thank you very much for interesting and appealing presentation.

this guy can handle his drink; he might go on a bit but else, you'd never know.....

At least one thing puzzles me, in this theory saying that "dark energy IS the lambda cosmological constant". As a constant, this energy is to be found everywhere / anywhere. Then why wouldn't it act on our Sun / solar system or Galaxy ? For now, my interpretation is : the presence of baryonic mass somehow keeps away the influence of dark energy, which action is happening only in places with very low density of baryonic matter. But then (if ever this interpretation is quite correct) : does anyone have any clue why dark energy would "care" to avoid disturbing portions of space with high baryonic matter density, while having "a lot of fun" in portions of space where this density is very low ?

@MyFoxworld

3 жыл бұрын

We are to believe that every action has a reaction, if we are depending on the speed of light to see supernovas now well then they actually happened billions of years ago, so in reality we are seeing the action and reaction at the same time! ie thousands of supernovas happening in close proximity would push everything away quicker!

I'm on my pad, fraknoy....

9:25 And in the UK.

"Explanation of issues, mistakes and questions presented in the lecture" 3:50 - universe is not "running away" (in to General Relativity "infinite arena void") - its the space expansion among galaxies due to accelerated mass accumulation in the galaxies nucleus (central gravitational vortex - spiral ones 70%) 4:00 - "dark energy" is a consequence of misunderstanding, that mass not curves (GR 1915), but expands space effectively.

great talk. He is an excellent lecturer

alright so, if gravity brings things closer and closer (accelerate toward center of mass), acceleration of expansion, is, by definition the effect of a negative mass. Also, if there is dark matter, why does it not fall into black holes???????? Of course, it can't work with a single metric, we need another in order to avoid the runaway effect when negative mass and normal mass interact.

@MysterySemicolon

2 жыл бұрын

Dark energy is just the name they gave the phenomena. There's no proof of what it actually is, much less that it reacts like regular matter and energy do in E=MC^2. How do you know black holes don't affect dark matter? We can't observe it, so we have no idea if it's affected by singularities.

The best candidate I have found for dark matter is the neutron group. We know that neutrons and protons will bind together in an atomic nucleus. The suggestion is that neutrons will bind together in groups of 2, 3 or more. These neutron groups would not decay in the same way as a single neutron decays to a proton and an electron. The neutron groups are charge neutral would have no associated electrons and would not emit or absorb light. In searching for dark matter, people have been looking for single particles ignoring the possibility that it might be a group of particles that we already know about. Neutron groups could be made in a laboratory giving the opportunity to study dark matter in the lab and demonstrate its properties. See Appendix 6 in this paper: www.academia.edu/5009126/The_evolution_of_the_universe Richard

@Kalumbatsch

7 жыл бұрын

The problem is that stable states of that sort don't exist. They have never been observed and contradict well-tested laws of nuclear physics.

Good talk theories and evidence but I.m leaning towards the EU guys they seem to make sense.

Put a telescope on the star "Altair" its throwing off of what looks embers from a far away forest fire. Dim red with a coma around the star arcs and goes west. It looks like a dirt road. This star is one of favorites because you can see flattening at the poles. Altair is in summer triangle.

dark enery might be the uncurling of the hidden 6 dimensions I guess ,fully uncurled we will have a vaster universe or 5 dimensions or both

@vashon100

3 жыл бұрын

A lot of waster enery

How is the expansion a constant if changes over time, including slowing,? Thats just silly. The heavy elements, (as an aside even supernovas cannot explain the heaviest elements), are spectrographically proven to exist about as far back as we can look and are really abundant in evolved nearby galactic clusters.Yet the supernova rate of about one per galaxy per century nowhere near begins to account for such abundance and uniform distribution. Both of which suggest seeding took place in the first third of universal expansion. For this to be true we should see supernovae popping like popcorn in a can in the most distant objects but we dont, I believe the rate remains about the same. Something not right in that.

@gamesbokgamesbok7246

6 жыл бұрын

Candidate Schmyles. Neutron star mergers can produce the heavy elements by the R process.

Sad title to this video

Same misrepresentation at minute 47:30. The modulus is NOT the distance between the event and the observation, the redshift [log(redshift)] is not the recession velocity. You are not presenting the truth to the audience.

@franckmalers2299

5 жыл бұрын

it's just the norm in these kind of "lectures". Also, did you get my joke ?

not plotting anything...

start 3:00

The run away universe" There is no run away universe. Where is it going to? from where did it come/start?- from another space? no no no. we are not moving away.

"let's not show those interesting slides supporting this interesting lecture but torture our viewers with showing 1 man behind a desk for almost 1 and 1/2 hour"

@kaigreen5641

8 жыл бұрын

+Tanks in Space I think you must have been watching a different lecture. I saw plenty of supporting slides

@ltr4300

5 жыл бұрын

Yeah I've noticed how anyone under 35 seems mentally incapable of staying engaged in anything unless there's plenty of pretty pictures and a techno beat thumping while the jarring seizure-inducing jump cuts keep moving back and forth between ideas so as not to overrun the average attention span...without something new every 5-10 seconds, we might start drooling and forget why we're watching...

;)

errr

Billie Meyer only gives the Universe another 300 billion years to exist! Then gone.... but birthing a couple more....Universe mitosis.

Most university’s don’t even have a astronomy department anymore because of Thier loose screw theories on the creation of the universe.

You claim your diagram at minute 41 is velocity and distance, which is absolutely false. THE MAGNITUDE IS NOT THE DISTANCE AND THE REDSHIFT IS NOT THE RECESSION VELOCITY. Your claim that the Universe is suffering accelerated expansion is only an artifact of your sloppy thinking and terribly bad analysis. If you were to properly analyze the real distance(s) vs. the expansion factor(s), as required by the FRW model, you will find the model which includes the cosmological constant is not the preferred model over many others. After 20 years of bad analysis it is time that your properly solved this problem.

Yawn,

This is a lecture for kindergarten

Andrew Fraknoi I don't know about you. Those weird speaking mannerisms. What you gonna do with all that?

@Truthmoses

8 жыл бұрын

he is the big boss man iyam...

@nicosmind3

8 жыл бұрын

I love the way he speaks. Hes interesting to listen to. Id love to hear a lecture from him, and everytime i hear his voice i know im in for a good time

@jesseback3536

8 жыл бұрын

+nicosmind3 I feel differently. Is he going to start yelling at us? Is he about to cry? Maybe burst out laughing hysterically like a comic book villain? Does he have another job as a pastor? Perhaps an announcer at a pro wrestling match? These are running questions when hearing him speak. How DOES one end up talking this way? Is it just the way he talks in front of an audience, or is he always like that? Could you imagine going out for coffee with Andrew?

@nicosmind3

8 жыл бұрын

Jesse Back I dont hear any of that and id love to have coffee with the dude and chew the fat :)

@jesseback3536

8 жыл бұрын

Truthfully, yeah, I would definitely have coffee with him if given the opportunity!

tHIS GUY DOESN'T BELIEVE IN THIS SHIT....bUT i DON'T SHARE HIS SENSE OF HUMOUR...tHE AUDIENCE ARE FAR CLEVERER THAN HE MIGHT HAVE ANTICIPATED...tHE WHOLEW THING IS depressing....

Had to bring in fu**** politics. Thumbs down

kindergarten level made up fairy tail cosmology story

Keep your politics out of science lectures.

boring not the subject but the crap speaker

@jesseback3536

8 жыл бұрын

Would you have preferred Andrew Fraknoi give the talk?