Its a good thing we have guys like Kim Griest, otherwise we wouldnt know much about the universe :)

a concise and very interesting lecture which I thoroughly enjoyed...thank you for posting.

The physicist has beautifully explained the concept of dark matter. Further the explanation on all around expansion where ever one would observe from was good.

this was a beautifully put together video. AMAZING as i would put it. it answered a lot of questions, while still raising more that we need to keep researching about. 5 stars!

very nice work!

Fascinating stuff, great vid, thx

In fact, the fact that we keep inventing things to make our physics fit reminds me of epicycles.

exellent lecture !!! thanx a lot !!! Kim Griest rulezzz in the skies :)

wow that was really interisting :D

so, you are saying that; we are made of very rare and precious stuff?

In the event of a big crunch, does this mean Entropy would reverse?

can somebody enlighten me on this:since there's nither a center nor a specific direction to the universe expention,shouldn't the microwave background be everywhere in the universe?and if so,is there posibility that we can still see the microwave background is because some part of it is actually next to us while some other part so far away that we can no longer detect?how can we be sure what we see is all there is?pls help me it puzzles me so much & forgive my bad english.

Hi I am UCSD student and I was looking at the video by Dr Joseph Rhawn. The video shows a 3D rendering that gives shape to dark matter using gravitational lensing. The video is called "Dark Matter Dark Energy & the Unknown Universe". Is it possible that what we call dark matter is actually the bending and twisting of space? Could it be that space-time is not as smooth as we thought?

Why they don't make a contest of ideas every few years on what is dark matter and energy. It is an idea problem not an unsolved mathematical equation. I have good ideas what it is but who needs it.

Can massive planets accommodate for the amount of matter needed to keep these galaxies together?

does dark matter exist in 3d space time or is it merely the lattice in another dimension holding us together.

We are rediscovering things we knew a long time ago.

48:02 "even within this universe we can have another universe formed" so could it be possibile that dark matter is the remnants of another universe which elements have different properties than the elements of "our" universe and therefore cannot be seen and only be identified by its gravitational effects?

i dont get the doppler technic they use to meassure speed. arent those galaxies like thousands lightyears away? so how can they send a signal which is faster than the speed of light.

"Energy is motion. Matter is opposed motion simulating rest and balance now through violent motion. The locational spherical inward absorption and outward emission of electromagnetic waves is forming antimatter matter annihilation, + and - electric charge, EM-fields, the flow of time and all the forces of nature. Thus Doppler and limited range of Spherical inward and outward waves causes redshift with distance, less energy exchange, less overlapping EM-waves interactions from a distance radius."

31:40 scenario #3, that sounds like a terrifying resolution to a currently habitable universe. Nothing as vicious as exponential growth applied to the velocity of immense concentrations of matter in a boundless macrocosm

now i understand more

32:43 Galaxies moving away and FASTER than speed of light? I thought nothing coudl physically be faster than speed of light can anyone clear this please?

13 people came into a hotel with 12 rooms and each guest wanted his own room. The bellboy solved this problem. He asked the thirteenth guest to wait a little with the first guest in room number 1. So in the first room there were two people. The bellboy took the third guest to room number 2, the fourth to number 3, ..., and the twelfth guest to room number 11. Then he returned to room number 1 and took the thirteenth guest to room number 12, still vacant. How can everybody have his own room?

Theoretical physicists sound so convincing- and really, they know very little of what they are talking about.

I like his video better than most because he came from experiment and did calculation.

wow i thought he was gonna kick into the stutter rap for a second then

@elliotts252 sorry about the long posts btw. I had to split up what i had to say and that made me get off course and forget what I wanted to say 100%. And just to be clear, the documents Im refering to in the first post is the original documents of the bible.

This is awesome! You can tell he is trying VERY hard to keep it simple. Oh, and what's up with all scientists not shaving >.

Amazing explaination for non scientific mind like me... somehow this guy remind me of Mitchell Pritchett from modern family :D ... btw is higgs boson a WIMP???

Can it be that the issue with dark matter and dark energy could be resolved with some new theoretical approach about universe that we yet have to come up with? ..It reminds me how it was in the past when people thought for example that there is substance called ether or even more in the past when we thought we are centre of the universe and everything revolves arround us inside certain spherical layers and many other examples of beleives that persisted for centuries and were simply resolved with some new theories and today look funny to us. I've seen some scientists already have this approach to resolve the dark issue with some new theories of gravity and space time.. It seems too simple conclusion we made for the existance of dark energy or dark matter just from some movements of the space stuff we observed and we just started into serious scientific cosmology like few decades ago... Space is unimaginably huge, there is this huge empty space between galaxies, there is so much stuff there and so much to explore to make some definite conclusions with confidence... So, why nobody gives some other approach other than dark stuff, are we shure there is no other approach... But I like this lecture and how the speaker also keeps an open mind and in a way says that this is what we think it is for now but who knows what will come up next. Great interesting inspiring talk and great speaker... Thnx

The higgs boson is a subatomic particle that provides mass. WIMPs are just another theoretical particle with properties defined to explain dark matter. They're not the same, hope this helped :)

I liked this video, kay?

i agree black holes will def lead us somewhere...in understanding more about the universe...the fate of this all....the systems....

@elliott252 im saying that either one hasn't disproved the other and theres a way they can work together instead of people trying to seperate them and saying one is inferior to the other.

"There never was a pulling gravity from a distance or dark matter. Because all the forces of nature are formed by E2 a locational spherical inward absorption density + and -outward emission density now of electromagnetic waves. Now is a moment of emission from Planck's constant the shortest unit of measurable time now radiating outward from an object of mass, relative to their own energy like dropping pebbles into a plasma pond multiplying compression of E =+m.c2decompressing expanding spheres."

@dredsin212 when thinking of weather you can find the storms by looking at the isobars(pressure lines) closer they are clouds will form. Now if you've seen isobars before from satellite compare it to this video of dark matter (Dark Matter Dark Energy & the Unknown Universe) and you will see the similarities.

The Ultimate Fate of the universe This book was written by Jamal Nazrul Islam. He is from Bangladesh.

All forces of nature are forming out of E2, as waves come multiplying ones E energy compression input. Time is inverse like multiplication+/-division or frequency and wavelength and is a bit like a rain drops cascading downward compressing a volume within body of water and that division of expanding wave fronts, like that now from the Sun now the continuous outward momentum of the light C2 is forming an inward force called gravity inversely proportional to the square of distance from its source

“It is a capital mistake to theorize before one has data. Insensibly one begins to twist facts to suit theories, instead of theories to suit facts.” Sherlock Holmes Quote Dark Matter as physical matter come to mind!

@elliott252 Of course, it is impossible. Into the second room should have gone the 2nd guest, because the 13th guest was waiting in room number 1.

This might sound stupid but if the Big Bang was an explosion then won't we all just... Fade, I mean in a normal explosion all the energy eventually fades away and the bigger the longer it is soo won't everything thing just eventually fade away??

@elliotts252 it may not all have been exactly wat I wanted to say but hopefully you get the picture.

The Big bung never happened because Redshift with distance a consequence of the limited range Spherical Inward +, and -outward chain wave reactions with distance and Doppler causes redshift. Mass plasma field vector +Mu, spherical region of Infinite universe or E2, acting upon accelerating mass +m-, from a distance radius as waves come forming the inward absorption + and -outward emission of electromagnetic waves that's forming all forces of nature as time unfolds C2 from an individual ref-frame

Space E is a division of solidity M into entropy C2 second law of thermodynamics but also E2 forms a square of future probability as waves come 4pi R2 compressing E=mc2decompressing expanding spheres now from Plancks constant shortest unit of measurable time radiating outward from an object of mass relative to their own energy multiplying electrical potential within like dropping a pebbles into a plasma pond the constant outward momentum of the light C2 is forming an inward force called gravity.

my family bloodline when I was 16

my family are in on it

A wimp is a theoretical smaller-than-microscopic particle capable of passing through the other four states of matter (solids, liquids, gases, and plasma) because it is made up of an entirely different category of "stuff" than the typical protons, neutrons, and electrons. So it might be a form of dark matter.

i think of dark matter as very low pressure, when you think of hurricanes the eye of the storm has the lowest pressure causing the molecules to get sucked into the middle and same with tornadoes the lowest pressure is at the base causing molecules to spin/rotate around it. Now compare that to a black hole.

the question's are just questions and one should not become obsessed with a question. we don't need to understand space parameters because you might as well focus your energy to something else and move on from the fact that it's a waste of time trying to figure it out.

@elliott252 but if you also study religion, the muslims, jews, and christians all talk about the second coming (the last judgement of man). Which could happen before that takes place. Religion can be worked out with science. There are questions in both the science world and religion world. However, not all of them can be answered. Why not let people want to believe in both instead of forcing them to believe one or the other until one side can provide every answer (which is very unlikely)?

@3pntballh0ckey3 that could be, except dark matter is thought to be anti-gravitational. and black holes are where gravity goes to infinity...but good thinking bro

astrology is my fav' subject

I read somewhere that the universe is cooling. Ambent temperature in space is dropping.

The horizon is an imaginary line that resides as you approach it. Just like looking out to space.

Perhaps it is not only gravity binding stars to their galaxies. It is not gravity that binds on the atomic level but electro-magnetism. There are about 20-30 things about our own sun that cannot be explained by atomic/gravity theory. 2million degree atmosphere, 6000 degree surface for one. But make perfect sense looking at the sun as an electric phenomena.

What dark matter is could also be what ever matter lies outside the range of what can be observed in a region of space that is expanding faster than the speed that it's light can reach us.

@sowhatsnew205 MACHOS and WIMPS are possible candidates for the dark matter. Massive cometary halo objects may be massive, dark clumps of matter orbiting the galaxies. Weakly interacting massive particles are particles which may have great mass but aren't normally observable because they don't interact with normal matter and son't emit radiation.

@annfoxshao Yes. The CMB (cosmic microwave background) has been analyzed since the late 1960s. The peturbations measured by the WMAP satellite and other sensative instraments has provided us with a very detailed picture of the early universe about 400,000 years after the Big Bang.

I'd consider Hector Salvador, but perhaps a new Big Bang will happen in the future of the Universe.

@GShock112 Nothing can move faster than the speed of light trough space, space it self however can move in any speed.

@WatchCharmedOnline You can't be biased

@AndrewRaimonSavage Yes, but a particle has as much to do with the idea of Gods as the snowman has to do with a stars interior or my Ipod. Its just another particle, one can call it whatever one wants, the name of an object does not imply the objects function.

@GShock112 well if you step hundreds of years into the future, all those galaxies will have disappeared further into the past, meaning that from here, we will no longer be able to see them, and we would have a different perspective of the universe: that perspective being innacurrate and completely different from what we know today.

@3pntballh0ckey3 I can't answer your question and I have paid my dues as a physicist. I hope someone else can answer. In any case, keep thinking and wondering. It's not what physicists know that they are excited about as it is questions they can't answer yet. Good question.

@helltrackrider its streachy :3

@3pntballh0ckey3 This is something to think about.. come to think of it, i wonder how would dark matter would react if it gets into a black hole.

it's not really an assumption, is it? it's a specific kind of supernova being measured. But otherwise, you are correct - not all kinds of supernovas have the same brightness, since they don't share the same kind of origin. Try reading up some more on physics and astronomy, I'm sure you'll calm down. And good luck!

This is my favorite part 26:27...So is sitting on a raisin looking back at the center of the loaf is like looking back in time....Another thing about expansion theory is it seams to have to be pre-organized to function in the way described...It seams like a funding battle between MACHO scientists and WIMP scientists....all you need to know really starts here...46:09

@elliotts252 Science is needed and is extremely important but it has no buisness denouncing religion. Both are needed to provide answers for individuals who dont have a bias for either side.

@mangaka08 and u know this because an old book told you so?

"Obviously all objects of broken symmetry that we interpret spherically distributed around us as light waves come stimulating our brains would be at the centre of their own 3D ref-frame's within an observable spherical region of the Infinite Universe. And your right I have no evidence! Just like the stupid Big bang theory. I am trying understand internally constructed within my own brain why each object of broken symmetry or an individual's external reality is the way it is as the waves come."

Did anyone ever wonder if the universe is in a constant cycle? Big Bang, Big Crunch, Big Bang, Big Crunch, etc.

@washmlakid watch some more vids,, black holes do drag matter into them, not even light can get out,, the universe is expanding and contracting into black holes which will eventually become one and create a big bang...

@tdjdk haha nice

so.....aliens are out there waiting to eat my brain....

if only you could bottle that...

The majority of the stuff is called membrane I think, see the speculative M theory.

Jeans?

@mozety no it not nearly enough

What if the dark energy is growing denser as the universe expands instead of growing less dense? Then dark energy would conquer all! Scary...

@washmlakid watch some more vids,, black holes do drag matter into them, not even light can get out,, the universe is expanding and contracting into black holes which will eventually become one and create a big bang... the vicious cycle of the universe

@TheUltimatebabu some people can still believe in a God and think of science as a way to explain his creation. That persion will have to be open minded though and there are alot of people out there like that.

@elliotts252 It hasn't said science sucks or anything like that unlike the other side.

@BroBroDude I just said that.

You've got your epicycles in my peanut butter!!! You've got your peanut butta in my epicycles!!!

toroidal fields

No guarantee on human existence. Enjoy it while it lasts.

@Vergil017 And those very inferior human brains as you call it are the same brains that came up with the idea of Gods in the first place, are you saying that we should trust our inferior brains when it comes to a favored idea that explains nothing, but mistrust the same inferior brain when it investigates things we can actually test and predict the outcomes of with our theories?

3 family's in the world with it the astral said it was 1 in the world with it

mmm..kai?

2nd try. Perhaps the dark matter halo is a pressure field where the 5th dimension interfaces with our 4th dimension. After all, stuff has to come from somewhere and since the where cannot be seen with our instruments, we think a god is doing it. This is difficult to ascertain because of our inability to describe this god, much less any accompanying motive. So go ahead describe god, then you will be equal to it. (Waiting).

you mean 4d space-time.

Mathematics can prove/show laws of nature that you can not see. Next thing to do is to carry out experiments to prove agreement. Explanation?? Sure, I suggest: go to science27. com read at least the abstract and introduction. It takes you max 5 minutes and it is easy. Now jump to chapter 14 The Pioneer & Flyby Anomaly Be sure also to follow the link to the mathematically proves. Understanding these two simple laws of nature will automatically also explain the cause of dark matter.

what amazes me, is this guy, he is at least one of the smartes people that have been on youtube, and yet, he tries to explain one of the most complicated concepts, in an easy, humble, funny way. I know people with an IQ of key, and they have an ego in the size of the WIMP and MACHO combined together. ok... where is the next video of this guy?

@BroBroDude no it does not help at all. Believe what you believe and vice versa.

@pika1ex I knew it!!!!!!!!

An atom runs on electricity,your brain works on electricity, this planet works on electricity...and believe it or not so do the stars and galaxy's

@WatchCharmedOnline thing is, religion hasn't been proven wrong. Im just saying religion and science don't have to be seperate. People don't have to choose sides. A person can believe and still be into science and want to learn about the wonders of the universe. I think bashing either side is true ignorance.

@elliotts252Each side can explain alot.Science can explain how MOST things are created.Religion has told many stories of a God, but both sides can't provide all the answers. A person needs both to fully understand life. Religion for spirit, mind, and body. Science for explaining the unkown. If you are a science person and believe there is intelligent life out there due to numbers, you cant deny religion because the number of people that believe are many and there are many documents about him.