The Royal Institution
Frank Close looks at how observations from galaxy rotation and gravitational lensing can imply the existence of dark matter.
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Frank Close gave the 1993 lectures “The Cosmic Onion” tracing a hundred years of discovery and invention
In his final lecture, Frank Close looks at the parts of the universe that are invisible to us.
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I was waiting for this.
thanks RI
So basically this is gravitation lensing in practice once again 😉
Dark matter or emergent gravity. My money is on emergent gravity.
There are no Black Holes, Galaxies are not Draining vortexes, they are Trailing vortexes.
Unfortunately, the image of the galaxy is rendered by artist. Not the actual photo. Think about the accuracy of a rendering image.
After years of research and countless billions they have found nothing.
Needed, Playlist(s); Christmas Lectures (2018)
Water then, could be classified as "Dark Matter" , par your definition of it.
I think maybe, perhaps, this is closer to what you are looking for : https://youtu.be/nU9tzfLbAu8
no ?
Job security: Getting paid to look for something that does not actually exist in an economically driven world.
For example: Is the universe truly expanding? OR is our solar system being pulled toward our galactic center in this spiral shaped galaxy that is spiral shaped for a reason in a cause and effect universe? And utilizing known forces of nature too, no dark matter or dark energy even needed.
More 'fairy tale' beliefs just like 'Christmas' lectures? It's hard to be a sincere truth seeker with so many deluded individuals in this world.
If only my science class at school had been this good …
Of cause it can't be that science doesn't understand gravity or that it might be super massive black holes roaming the Universe or Unicorn poop in large quantities.
Amazing series and lectures. I thought modern physics is impossible to teach to kids in an intersting way, because it is hard to visualize, and it’s more about raw math. But you nailed it.
$50 bucks says dark matter isn't real.
Is this old?
The majority of it is dark energy, 70% or so.
Variable star?
Has there been any more work done on the electromagnetic theory that is supposed to complement gravity on a cosmic scale? That always seemed an interesting way to explain the fact that gravity couldn't account for the behavior of the matter we can see.
Crystal clear! That's how physics should be taught to children!
(I'm looking at you dear physicists trying to teach our children about electricity :D)
Surely, if darkmatter is capable of gravitational lensing , it must be act at a point , so, like normal mass , it would also create chaos as it/they neared stars? And since it makes up 90% of the mass its effect would be very very obvious?????
That kid was immensely helpful
I discovered their mistake.
See the stars are not flung out of the galaxy because it is not their velocity that makes them escape the gravity of their galaxy, it is their acceleration. The stars would not be able to escape the gravity of the galaxy if their acceleration rate was quite small. I deduced that all the stars gain an acceleration of around 1 mi/h every 10,000 years. That small acceleration is not enough for the stars to escape the gravity of the galaxy. Their velocity doesn't matter, it is their acceleration that would make the difference. Think about it, if a rocket was orbiting the galaxy with a small increase in it's velocity of 1 mi/h every 10,000 years it too would not be able to escape the gravity of the galaxy or be flung away. It would still take the rocket hundreds of thousands of years to make one complete orbit, so it would continue to orbit the galaxy for as long as it had fuel no matter how fast it went.
The 1:10,000 acceleration ratio is standard for every star and galaxy throughout the universe. Let me show you.
Sun velocity = 500,000 mi/h and age = 5,000,000,000 years old. Acceleration = 1 mi/h every 10,000 years.
Milky Way galaxy velocity = 1,370,000 mi/h and age = 13,700,000,000 years old. Acceleration = 1 mi/h every 10,000 years.
Carnia dwarf galaxy velocity = 1,300,000 mi/h and age = 13,000,000,000 years old. Acceleration = 1 mi/h every 10,000 years.
Draco dwarf galaxy velocity = 1,280,000 mi/h and age = 12,800,000,000 years old. Acceleration = 1 mi/h every 10,000 years.
Sextans dwarf galaxy velocity = 1,240,000 mi/h and age = 12,400,000,000 years old. Acceleration = 1 mi/h every 10,000 years.
Note , every velocity I described here cannot be described by Einstein's general relativity! That is why they came up with dark matter and dark energy, because the movement of 95% of the mass in the universe cannot be described by his theory. So instead of acknowledging that relativity is wrong they add mysterious unknown forces to compensate for Einstein's mistakes.
Like I said, the acceleration for stars and galaxies are standard throughout the universe.
Meaning stars and galaxies slowly propel themselves at a constant acceleration of 1 mi/h every 10,000 years. Their acceleration being so small is not enough to escape the gravity of the galaxy they are in. Their velocity has nothing to do with being flung out because of the time it takes to make one complete orbit.
Dark matter is dead and I figured it out so easily too. I'm a natural problem solver.
Lol, and the hypothesized dark star that made the one star brighten @ 4:21 did so to the other stars too, meaning that someone adjusted the lens on the measuring device, the aperture or they used a different exposure time to allow more light into the measuring device. If a black hole passed in front of that one star to cause a lensing effect the others stars would not have gotten brighter at the same time.
The cosmic onion was one of the best Christmas lectures.
Why not a stellar black hole or permordial black hole get orbited between that star and earth instead of dark Star at there
They are held in space by the vacuum.
That lensing doesn't mean that the dark object detected is the dark matter searched for.
dark matter = https://youtu.be/uipT-me_e1s = BLaCkLiGhT PoWeR = water = ✨ = ??
4:26 Perhaps the "dark star" or something else moved behind the star opposed to in front of it, and we are seeing a bright reflection, explaining why the star "suddenly" or over the period of a few weeks as stated before, got brighter. Also, how come all of the other stars around it got bright also.
To me, it actually looked like someone made the photograph blurry, kind of like if you were looking at lights off in the distance with some binoculars and you were to change the dial on the binoculars, the lights in the distance become blurry until you adjust the binoculars back to a setting where you can see them clearly. Just a few thoughts..
Very interesting information he put out though.
Elusive gas indeed
Clearly (and sadly, I might add), you guys need get updated on this topic (the cosmos).
What would happen if a black hole ate matter and anti-matter?