The End of the Universe

The Universe is expanding, increasingly so. Will this persist or will it collapse back on itself? If it does expand forever, what happens to the galaxies? What is the long-term trajectory for the ultimate in collapsed matter, black holes?
A lecture by Katherine Blundell OBE recorded on 31 May 2023 at Barbican Centre, London
The transcript and downloadable versions of the lecture are available from the Gresham College website:
www.gresham.ac.uk/watch-now/e...
Gresham College has offered free public lectures for over 400 years, thanks to the generosity of our supporters. There are currently over 2,500 lectures free to access. We believe that everyone should have the opportunity to learn from some of the greatest minds. To support Gresham's mission, please consider making a donation: gresham.ac.uk/support/
Website: gresham.ac.uk
Twitter: / greshamcollege
Facebook: / greshamcollege
Instagram: / greshamcollege

[@donaldbustell]

Thank you very much. I have greatly enjoyed all of Dr. Blundell's lectures. I am very sorry that she is leaving, but will hold out hope that she returns with a report on the work she is now setting out to do. [FWIW, I'm a retiree in the central U.S.]

[@gabrieldunn7384]

You might like Carolyn Crawford's Gresham lectures from several years ago.

[@seazenbones6945]

I have understood more about the universe through Dr Blundell’s lectures than ever before in my 60 odd years on this planet. I thank her and wish her the very best with her Global Jet Watch mission. Brilliant lectures. Thanks to Dr Blundell and Gresham College from Australia.

[@user-ol2mr4bx7c]

You learn some serious word smithing with Dr Blundell. Word of the day: asymptotically

[@Metaldetectiontubeworldwide]

What a great lecture again ☆☆☆☆☆ I could listen to dr. Catherine 's voice, lecturing cosmology ,, forever . Grrz Johny Geerts

[@spaceinyourface]

All ways enjoyed your lectures 👌

[@iqiwq]

amazing lecture, thank you!

[@elizabethclaypool1961]

Love love

[@user-up8jx3mt6j]

It is true. If you pan away from planet Earth, our entire solar system becomes a speck and impossible to even see. Pan out further and our entire galaxy becomes a speck. Eventually the milkly way disappears completely. And this is only the currently observable universe. We can only see ~ a hundred billion light-years of diameter. This distance is unfathomable. And to think that it just goes on and on. What else truly disappears into oblivian, how big are your problems ?

[@RichMitch]

Wish it would hurry up

[@WooliteMammoth]

🤣

[@charlesbrightman4237]

Don't worry, it will all be over soon enough.

[@JJONNYREPP]

The End of the Universe 2128pm 12.6.23 making vast generalisations and assumptions may just be the issue. Maybe science, like any other trusted source of propagating information and knowledge, should desist from making those assumptions. would that mean they would have to admit they know very little as opposed to one hypothetical notion taking precedence over all other notions????

[@RichMitch]

@@JJONNYREPP at least you have your day/date in the right order 🤝

[@charlesbrightman4237]

@@JJONNYREPP "The End of the Universe 2128pm 12.6.23 " and above in my thread for this video you posted: "The End of the Universe 2131pm 12.6.23 ". Which is it, 2128pm OR 2131pm? Or is that 'start' 'stop' times of when the universe ends?

[@avivyat8694]

9:39

[@JJONNYREPP]

The End of the Universe. 2123pm. Can't. wait. What now until the end? Ummmmm... travel scrabble?

[@ademrayen9146]

We all dead

[@chadgun4135]

We need English language lesson

[@charlesbrightman4237]

We apparently were all destined to die and go extinct even before we even ever came into existence.

[@JJONNYREPP]

The End of the Universe 2141pm 12.6.23 weirdly would folk have to pay for these lectures if they had something new to impart as opposed to giving the samel ecture from 300 years ago...? no doubt 30 years or so ago man city won the treble for the first time...? "match without observations" joke.

[@charlesbrightman4237]

Dark Energy: Modern science claims that energy cannot be created nor destroyed. "IF" dark energy already existed in existence, then it should have already done it's thing. "IF" dark energy came into this existence from another dimension, then from what dimension? And then also, can energy leave this dimension? "IF" modern science is wrong and energy can be created in actual reality, can energy also be destroyed in actual reality? "IF" so, what then of existence in this existence?

[@charlesbrightman4237]

QUESTIONS: What is the difference between 'energy' and 'dark energy'? Can anybody see 'energy'? What exactly makes energy 'dark'?

[@TaunoErik]

​@@charlesbrightman4237 dark means the darkness of our knowledge

[@JJONNYREPP]

The End of the Universe 2131pm 12.6.23 if energy is created from other sources interacting with one another it would suggest it is an organic aspect of the known universe...

[@charlesbrightman4237]

@@JJONNYREPP " if energy is created..." It would be interesting how that could actually occur, 'if' true. But then also, what if 'if energy is destroyed'??? What would occur to the universe and our existence then?

[@acr08807]

@Charles Brightman You're right that energy is not conserved in an expanding universe. "Modern science" is well aware of this, so it does not claim that energy cannot be created or destroyed. Still, the expansion of the universe is slow over short distances, so conservation of energy holds for almost all practical purposes.

[@jfhoward8264]

The Universe, it doesn't end...

[@krunoslavregvar477]

Hmmm... Very nice lecture. But, in some critical staffs, I disagree with lecturer. And, I am not flat-earth-er.

[@michaelhoffmann2891]

You may disagree and we are all agog to see your peer-reviewed paper on your alternate proposal!

[@user-se2xm5yp6u]

It had no start, and it will have no end.

[@johnvaleanbaily246]

Sorry... I fell asleep listening... are we dead yet ?

[@TaunoErik]

you are sleepwriter?

[@user-se2xm5yp6u]

Yes so sorry we are, you can go back to sleep now

[@paulcampbell7518]

Presenter makes constant reference to previous presentations - Those references are largely a waste of time - She could make far better use of her time by actually covering the topic in earnest, and without the constant self-promotion.

[@tonyevans9999]

I believe this is one in a series of lectures, and those references would make perfect sense to the audience she is addressing.

[@billynomates920]

which is why they are even more of a waste of time! @@tonyevans9999

[@johngeverett]

Those lectures are also available here on YT, at least the ones I noticed. No need to go into detail here when she has already done so.