How Far can we Observe the Universe 🤯 explains Physicist Brian Cox

This light, known as the cosmic microwave background, or CMB, marks a time 380,000 years after the universe's birth, when protons and electrons joined to form the first atoms. Before that time, the cosmos was opaque to light.
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Brian Edward Cox is an English physicist and former musician who is a professor of particle physics in the School of Physics and Astronomy at the University of Manchester[2][3] and The Royal Society Professor for Public Engagement in Science.[4] He is best known to the public as the presenter of science programmes, especially BBC Radio 4’s The Infinite Monkey Cage and the Wonders of... series[5][6] and for popular science books, such as Why Does E=mc²? and The Quantum Universe.
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[SqwarkParrotSpittingFeathers]

The closest thing I can see with the naked eye is my blurred nose.

[davidgrech]

Thank you so much for your positive energy and hope you have a great rest of your week Brian 🌍

[Wriggs]

This reminds me of the episode of Star Trek voyager where they are stuck above a planet and life is going much faster on the planet than it is on Voyager. I sometimes look up at the sky at night and think, whoever is up there, is no longer there because how fast time travels. Space is cool.

[alexchudilovski]

Ok. I have something to say..

So if there is cosmic background radiation and it already reached us in this point of space and time to be observed by us, that means that whatever has reached, is finished it's journey, at least for us, unless of course we, an observer somehow go ahead or "cut the corner" to become visible for it(the reaching object) again. Minus light that has already been "used", utilized during the first round of observation.


Now, with that being said, let's speculate about nature, for example, if it is true that there is a beginning. That there are no "aftershock waves". I'm sure I answered this question previously but I am still puzzled, why are we still able to catch and observe background radiation, why is it a continuous event? Has something to do with expansion, with an observer itself, that still has origin to the event.

I forgot everything, the river has dried out, I can see the river bed but I forget everything, there is no water!

[anwealde]

the closest object i can see with the naked eye is definitely not some other galaxy

[Claudbar]

Everyone says light it’s the fastest thing in the universe. And yet . Light in the universe travel slow . Because we see objects in the past light . Not the actual light of today’s light .what we watch it’s past light . So that means light itself fast but not so fast . Because if light was that fast . We would see the universe in present time . Not past time ☝️

[jamisonworrick]

So question, is the expansion of the universe faster than the speed of light? Because if that light began its journey, 13.8 billion years ago in light is supposed to be the fastest thing known, then how did we beat the light to the position that we’re at in space. Did the universe expand faster than the light did? I never seen the light from that far into the past. How exactly wouldn’t we be able to see the big bang itself in theory?

[TheJanstyler]

I have a question that might be dumb, but I'm genuinely unable to wrap my head around it at the moment.

How come, the matter that makes up earth reached this far into space BEFORE the light from "shortly after the big bang" did? This question, in different forms and with different accompanying thoughts has been stuck in my head for a while now. It feels like a question with a very simple answer, yet I just cant.

[daviddilley]

Are there stars whose light hasn’t gotten here yet….?

[danmiller]

Does Cox know the fundamental way of measuring a stars distance is parallax for Euclidean flat space with background stars assumed to be infinitely far away with lines of sight parallel over six months between measurements. The postulate by Euclid is "when two parallel lines are cut by a transversal, opposite interior angles are equal". The angle is measured at the eye of the observer. All methods of measurement depend on the validity of parallax. And it is no longer valid. Wheeler agreed and told me, " Distance measuements are difficult".

[ArsacioJJulioJr]

So, 13.8Billion years ago, what was there before the event? Was there a vacuum of space? Or something else?

[zack_]

But the CMB is several hundreds of thousand years after the socalled BB and not simultaneously, Of course you can still say it's 13.8 bly as it is not changed a bit by that relatively small delay. But this causes the misperception of simultaneity.

[Freddsche]

CBMR - what confuses me about it, why is it exactly the same distance from us in all direction? How about galaxies detected by Hubble or Webb that are ten billion light years away from us? Whould there, the CBMR also be the same distance in all directions?
Is the red shift of the CBMR becoming even redder over time? Apparently it's expanding and accelerating or isn't?

[stringsofpassion]

So when we are looking at nearby galaxies wirh a naked eye we are seeing what it looked some million light years away. So essentially we are blind to the planetary evelution of galaxies that may have taken place and evolved to life forms at present moment of time.

[elizabethholliday]

Damn this guy is incredibly intelligent and brutally able. I love learning from him.

[kailon]

How do you know the universe start with big bang?

[christopherstenton]

Are there objects that are so far away that we cannot see them yet?

[Killryno]

Could it be possible that past the 13.8 billion light year mark space could still be too dense and hot with plasma to create matter or let light out yet further placing our origins beyond any view?

[balamb]

so does it mean people on earth are from the FUTURE?

or why not reverse it when looking at the sky we are looking at the future and we are from the past?

like if you put yourself on a different galaxy and look at earth so whos from the past and whos from the future? coz you could have the same assumption while looking at earth .

[marc]

In which direction did the Big Bang occur and what is going on in the other direction, perhaps (relatively thinking) primitive galaxies forming?