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-   -   All of the starlight ever produced measured (http://e-group.uk.net/forum/showthread.php?t=49309)

wornish 1st December 2018 12:43 PM

All of the starlight ever produced measured
 
Some big numbers here.

4 X 10 ^84 photons.

Or put another way: 4,000,000,000,000,000,000,000,000,000,000,000,000, 000,000,000,000,000,000,000,000,000,000,000,000,00 0,000,000,000 photons.

https://www.sciencedaily.com/release...1129142414.htm

TimP 1st December 2018 01:36 PM

Re: All of the starlight ever produced measured
 
That’s an awfully round number, it can’t be right surely!

wornish 1st December 2018 01:49 PM

Re: All of the starlight ever produced measured
 
Quote:

Originally Posted by TimP (Post 464308)
That’s an awfully round number, it can’t be right surely!

Who knows its just a ballpark figure to get the order of magnitude. It sure is big *yes

Human brains can't conceive these types of numbers they are just big.

TimP 1st December 2018 02:10 PM

Re: All of the starlight ever produced measured
 
Can it be compared to the usual benchmark then? The size of Wales.

wornish 1st December 2018 03:56 PM

Re: All of the starlight ever produced measured
 
I'm bored so

There is a basic way to talk about the effective “size” of a photon, and that is through its wavelength. Very roughly, the interaction range of a photon scales with its wavelength, so light of longer wavelength is more likely to interact with a conductive material than light of a shorter wavelength. In this way you could say the “size” of photon is basically the width of its wavelength. The wavelength of green light is about 500 nanometers.
So its area is 250000 sq nanometers

Wales has an area of 20,735 square Kilometres.
Thats 20735 *10^24 square Nanometers.

So it would take (20735/250000) x 10^24 photons to cover an area the size of Wales

I think that's about 0.083 * 10^24 green photons

Or 8.3 x 10^22 photons.

So to answer your question the total number photons ever produced would cover an area equal to this many times the size of Wales

(4 x 10^82) / (8.3 x 10^22)

Thats 0.48 x 10^60 Wales. Assuming there are no clouds :D

OM USer 1st December 2018 04:42 PM

Re: All of the starlight ever produced measured
 
With all that light why do I keep shooting at ISO 2000?

wornish 1st December 2018 04:43 PM

Re: All of the starlight ever produced measured
 
Quote:

Originally Posted by OM USer (Post 464322)
With all that light why do I keep shooting at ISO 2000?

Maybe because all the photons are in Wales

TimP 1st December 2018 04:43 PM

Re: All of the starlight ever produced measured
 
Quote:

Originally Posted by OM USer (Post 464322)
With all that light why do I keep shooting at ISO 2000?

Perhaps you need to be in Wales!

(Damn! Beaten to it)

Naughty Nigel 1st December 2018 11:14 PM

Re: All of the starlight ever produced measured
 
Quote:

Originally Posted by wornish (Post 464303)
Some big numbers here.

4 X 10 ^84 photons.

Or put another way: 4,000,000,000,000,000,000,000,000,000,000,000,000, 000,000,000,000,000,000,000,000,000,000,000,000,00 0,000,000,000 photons.

https://www.sciencedaily.com/release...1129142414.htm

How many London Buses is that? And how many football pitches would they need to park them all?

Come to that, how many Olympic swimming pools of water would you need to water the grass that the London Buses are parked on? :D

pdk42 2nd December 2018 12:15 AM

Re: All of the starlight ever produced measured
 
Pink Floyd, Echoes:

Quote:

And through the window in the wall
Come streaming in on sunlight wings
A million bright ambassadors of morning
Wonderful piece of music...

(even if 10^6 is somewhat of an underestimate - you'd have thought that Brian May, having a PhD in Physics, would have known better).

TimP 2nd December 2018 07:40 AM

Re: All of the starlight ever produced measured
 
Where does Brian May fit into Echoes?

pdk42 2nd December 2018 08:49 AM

Re: All of the starlight ever produced measured
 
Quote:

Originally Posted by TimP (Post 464367)
Where does Brian May fit into Echoes?

Good point ... confusing Pink Floyd and Queen! Duh.

TimP 2nd December 2018 08:54 AM

Re: All of the starlight ever produced measured
 
I wondered if I was missing something!
Two bands not easy to confuse really.
Saw them both in the 70s, never since though. I think Floyd was the DSOTM tour and Queen we’re supporting Mott The Hoople and then headlining. Happy days.

pdk42 2nd December 2018 09:18 AM

Re: All of the starlight ever produced measured
 
Quote:

Originally Posted by TimP (Post 464370)
I wondered if I was missing something!
Two bands not easy to confuse really.
Saw them both in the 70s, never since though. I think Floyd was the DSOTM tour and Queen we’re supporting Mott The Hoople and then headlining. Happy days.

Yeah, completely different bands. My only excuse was I typed it after an evening of wine and plenty!

You were lucky to see them both. Queen supporting Mott the Hoople? Nice.

Mind you, I saw Dire Straits in the late 70s and they were supporting Talking Heads.

Zuiko 2nd December 2018 10:00 AM

Re: All of the starlight ever produced measured
 
Quote:

Originally Posted by wornish (Post 464303)
Some big numbers here.

4 X 10 ^84 photons.

Or put another way: 4,000,000,000,000,000,000,000,000,000,000,000,000, 000,000,000,000,000,000,000,000,000,000,000,000,00 0,000,000,000 photons.

https://www.sciencedaily.com/release...1129142414.htm

They are big numbers - it looks like the cost of Brexit to me! ;) :D *chr


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