Into the Universe with Steven Hawking

[Kompete]

Anyone watch this?

Saw it for the first time last night - Episode 3: the story of everything. Not much that I have not heard or read about before, but it was just so beautifully and simply explained.

I liked the concept of explaining how stars a made - so I wondered...if one somehow can get a 'stadium' full of hydrogen gas collated somewhere in space - sufficiently far away from any large object that can exert any sort of gravitational force on it - and leave the hydrogen particles to move closer under the force of gravity; will it go thru the same motions ito eventually fusing together to form helium and then later a miniature star???

Anyway looking forward to the nex epsiode - pity I missed the previous 2.

 

[MartyMarts]

I need a PA to remind me when all the worth watching stuff is on TV.

 

[Kompete]

I need a PA to remind me when all the worth watching stuff is on TV.

My PA's name is pvr

 

[Geriatrix]

if one somehow can get a 'stadium' full of hydrogen gas collated somewhere in space - sufficiently far away from any large object that can exert any sort of gravitational force on it - and leave the hydrogen particles to move closer under the force of gravity; will it go thru the same motions ito eventually fusing together to form helium and then later a miniature star???.

A stadium, no. You'd need a ****-ton load of H before the pressure from gravity would result in fusion happening. Can't recall the amount, ask the Google.

 

[ben dover]

My PA's name is pvr

My PA's name is Torrentz.com

 

[Naks]

A stadium, no. You'd need a ****-ton load of H before the pressure from gravity would result in fusion happening. Can't recall the amount, ask the Google.

The mass of our sun is 2 × 10^30 kg. So you'd need a bit more than that to make something similar in size

 

[Jonny Two Shoes]

I missed it because of the weather cutting out the signal just as it started was looking forward to it.

 

[Nothxkbi]

Anyone else notice the GP number plates on the Porsche near the beginning?

Its a great documentary, very interesting.

 

[BinaryJack]

Anyone else notice the GP number plates on the Porsche near the beginning?

Its a great documentary, very interesting.

Yep.
I saw the 100km sign and thought...that looks familiar and then the GP plates during the doppler explanation.

Anyone watch this?

Saw it for the first time last night - Episode 3: the story of everything. Not much that I have not heard or read about before, but it was just so beautifully and simply explained.

I liked the concept of explaining how stars a made - so I wondered...if one somehow can get a 'stadium' full of hydrogen gas collated somewhere in space - sufficiently far away from any large object that can exert any sort of gravitational force on it - and leave the hydrogen particles to move closer under the force of gravity; will it go thru the same motions ito eventually fusing together to form helium and then later a miniature star???

Anyway looking forward to the nex epsiode - pity I missed the previous 2.

The logic is sound but the problem is finding a place where there are almost no "significant" gravitational forces bigger than what the molecules will exert on each other.
I am happy to be corrected on this.

 

[Techne]

Watched a portion last night, must say it is thoroughly enjoyable.

 

[Kompete]

A stadium, no. You'd need a ****-ton load of H before the pressure from gravity would result in fusion happening. Can't recall the amount, ask the Google.

Why would you need *****e load of H? Yes, it would definitely increase the gravitational pull of the H atoms - but with no other counter (gravitational) forces in place, and given sufficient time (lets say millions of years) even only a 'stadium' full of H will eventually collapse into itself to fuse the atoms...no?

Yep.
The logic is sound but the problem is finding a place where there are almost no "significant" gravitational forces bigger than what the molecules will exert on each other.
I am happy to be corrected on this.

So in theory it is possible? The universe is a pretty large place - mostly empty space, I'm sure there must be areas with virtually no gravitational forces pulling

Watched a portion last night, must say it is thoroughly enjoyable.

dont forget its also on Sunday's at 20h00 on discovery HD

 

[Geriatrix]

Why would you need *****e load of H? Yes, it would definitely increase the gravitational pull of the H atoms - but with no other counter (gravitational) forces in place, and given sufficient time (lets say millions of years) even only a 'stadium' full of H will eventually collapse into itself to fuse the atoms...no?

No. Fusion in stars is mass dependent.
http://en.wikipedia.org/wiki/Nuclear_fusion
http://www.astrophysicsspectator.com/topics/stars/FusionHydrogen.html

 

[Nothxkbi]

For all us Back To The Future fans out there, just thought I'd drop this one in here as I'm sure you've all pondered on this before as I have. Hawking also briefly touched on the topic in the documentary.

Grandfather paradox

The paradox is this: suppose a man travelled back in time and killed his biological grandfather before the latter met the traveller's grandmother. As a result, one of the traveller's parents (and by extension the traveller himself) would never have been conceived. This would imply that he could not have travelled back in time after all, which means the grandfather would still be alive, and the traveller would have been conceived allowing him to travel back in time and kill his grandfather. Thus each possibility seems to imply its own negation, a type of logical paradox.

Another paradox similar to that was developed by Stephen Hawking in his TV Documents, Episode 2 in 2010 series, Into The Universe With Stephen Hawking. According to the paradox, a young scientist travels into the past one minute with a time machine he just built. With him he took a gun and killed his past self that was loading the gun, instantly killing him. The question is though, who fired the shot? The loop stays open with the person being dead who fired the shot. According to the theory however, there is always a cause before an effect saying that the future man is a copy of the past man, meaning he killed a different person.

http://en.wikipedia.org/wiki/Grandfather_paradox

 

[ALFAHOLIC]

I was highly dissapointed with that show. I really looked forward to it. Was it not the 1st episode on DSTV the 13th?

He makes too many assumptions that he bases his entire 2 hours of facts on...a fact based on an assumption?

He lost me at...the universe started out of nothing...nothing? Look around you , tell me if you see nothing? Nothing doesn't exist, even the invisible air is something!

 

[Techne]

I was highly dissapointed with that show. I really looked forward to it. Was it not the 1st episode on DSTV the 13th?

He makes too many assumptions that he bases his entire 2 hours of facts on...a fact based on an assumption?

He lost me at...the universe started out of nothing...nothing? Look around you , tell me if you see nothing? Nothing doesn't exist, even the invisible air is something!

He said that in the first episode?

 

[satanboy]

Awesome program.

 

[ALFAHOLIC]

He said that in the first episode?

That's what I don't get...OP says its the 3rd episode that played Wednesday night on Discovery, either i'm watching a discovery that was swallowed up in a black hole or Discovery was wrong with the dates. THis effectively means that wednesday night's episode was the 3rd then and not the 1st as they had advertised.

 

[Techne]

That's what I don't get...OP says its the 3rd episode that played Wednesday night on Discovery, either i'm watching a discovery that was swallowed up in a black hole or Discovery was wrong with the dates. THis effectively means that wednesday night's episode was the 3rd then and not the 1st as they had advertised.

Oh. But did he say those exact words, I did not watch it, I just want to know what he said with regards to that particular matter.

 

[ALFAHOLIC]

LOL he said the universe started from Nothing...to his defense, he did say the idea is crazy! LOL...

 

[Nothxkbi]

LOL he said the universe started from Nothing...to his defense, he did say the idea is crazy! LOL...

Dawkins knows better than to say something like that. I'm presuming the narrater took the liberty to over-dramatize the big bang.