Brian Cox Explains Gravitational Lensing and Dark Matter Using the Abell 2218 Galaxy Cluster.

Brian Cox discusses a photograph of the Abell 2218 galaxy cluster, located approximately 2 billion light-years away. He explains the phenomenon of gravitational lensing, where the light from distant galaxies is bent and distorted as it passes through the warped space-time created by the massive galaxy cluster. This effect creates arcs in the photograph and allows scientists to calculate the mass of the intervening galaxy cluster. He compares this to looking at an image through a wineglass, where understanding the image helps determine the shape of the wineglass. The measurements from gravitational lensing reveal that there is much more matter in the universe than what is visible in stars and galaxies, indicating the presence of dark matter.

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[kenwhitfield]

The best explanation I’ve heard yet to explain how mass in the universe can be measured. If we can measure how much space-time is warped by a given mass, then it is simple to then calculate how much mass is required to warp space-time by the amount that is observed.

[AleraRealty]

Brian brings a unique freshness to this world of physics

[maxeadon]

My sister in law warps space time. I am not saying she is overweight but I can see the house behind her.

[rpmazzella]

That was explained so well. I even understand it. Thank you

[rodg]

I could listen to this information all day.

[rotter]

So much easier to understand when wine glass visualisation is suggested.

[glen]

....and some people still believe that the earth is flat !😵‍💫

[_starfiend]

Why couldn't this guy have been my physics teacher at school?

[CymaticFanatic]

Every time I listen to Brian speak Im amazed at how eloquent and easy to understand he makes quantum mechanics and astrophysics

[JeanSmith-qk]

Those stars are witnesses to the birth of all of humanity

[terryadkins]

Some people would sooner believe in a book of myths and laugh at these truths.

[SuperKrishna]

I am now in love with the word 'Aaarcs' 😍

[hsiaowanglin]

Wowed, what a remarkable performance from 2 billions years away, the scientists’s brain function is so fast, no wonder not many people become famous scientists.❤

[touristguy]

...there are a good hundred or more galaxies in that photograph, with many more obscured by each one.

[markperryman]

Light travelling for a billion years, the distance, the mind boggles

[compound]

Imagine how many different worlds there are and different forms of human being and other creation humanoids and non humanoids.

[petesharpe]

2 billion light years away means that these galaxies may no longer exist. Mind blowing.

[Brett]

My brain hurts trying to fathom the size of the galaxies and then the distance between them and how far away they are from us and realizing we will never be able to get there to see if there are other civilizations in any of those galaxies .

[MPD]

This is the best build up I've ever heard for a 'yo mama is fat' joke.

[Amivit]

This is scary. Scary to think about the mass graveyard that space is and how our planet, solar system, and galaxy will eventually die out and be nearly invisible aside from us bending light from our gravitational pull as the Milky Way floats through space lifelessly.