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[Crazydad]

Now i had every thing set up to do this Experiment, got going, speed was really good thought i might have

been able to read the speed off the Speedo,but................. it was to bloody dark..............................

[Scrawni]

Fascinating subject. The light travelling from the sun (at 186000 miles per sec) takes approx 4 minutes to cover the 93000000 miles to earth. Therefore, when we look at the sun, we are actually seeing it where it was 4 minutes ago. So, if the nearest star is 10 light years away, we are actually seeing that where it was ten years ago.

A star could explode and cease to exist and we wouldn't know about it for years!

Yes but as Einstien proved, gravity bends light, so that star that looks ten light years away might only be two light years away or possibly a thousands light years away :-/

[STMO123]

Fascinating subject. The light travelling from the sun (at 186000 miles per sec) takes approx 4 minutes to cover the 93000000 miles to earth. Therefore, when we look at the sun, we are actually seeing it where it was 4 minutes ago. So, if the nearest star is 10 light years away, we are actually seeing that where it was ten years ago.

A star could explode and cease to exist and we wouldn't know about it for years!

Yes but as Einstien proved, gravity bends light, so that star that looks ten light years away might only be two light years away or possibly a thousands light years away :-/

If anyone gets full of ale and reads this thread tonight.....there'll be some real sh1te forthcoming

[Crazydad]

Fascinating subject. The light travelling from the sun (at 186000 miles per sec) takes approx 4 minutes to cover the 93000000 miles to earth. Therefore, when we look at the sun, we are actually seeing it where it was 4 minutes ago. So, if the nearest star is 10 light years away, we are actually seeing that where it was ten years ago.

A star could explode and cease to exist and we wouldn't know about it for years!

Yes but as Einstien proved, gravity bends light, so that star that looks ten light years away might only be two light years away or possibly a thousands light years away :-/

If anyone gets full of ale and reads this thread tonight.....there'll be some real sh1te forthcoming

Then i shall Start [smiley=beer.gif] [smiley=beer.gif] [smiley=beer.gif] [smiley=beer.gif]

[Baron Von Spongebob]

So if a star is 2 light years away,,How many dark years is it then  :-/

Easy question  

[STMO123]

So if a star is 2 light years away,,How many dark years is it then  :-/

Easy question  

Move away from the beer

[Grumpy]

So if a star is 2 light years away,,How many dark years is it then

42

[Crazydad]

So if a star is 2 light years away,,How many dark years is it then  :-/

Easy question  

Move away from the beer

Give it to me

[theolodian]

Can a spot of light on a surface travel faster than the speed of light if you swing the lamp really fast?  And if so, does that mean that information can travel faster than the speed of light?

[Baron Von Spongebob]

The only thing i know thats faster than the speed of light is SWMBO emptying my wallet..

[Crazydad]

The only thing i know thats faster than the speed of light is SWMBO emptying my wallet..

Do our wives know each other

[theolodian]

The only thing i know thats faster than the speed of light is SWMBO emptying my wallet..

Do our wives know each other

Wait, why am I bringing mine to Wales?  I don't need her learning from yours!  She's behaving so far . . .  :-/

[Golfbuddy]

I've been following this one for a while whilst I tried to get my head round the question. My theory is as follows.

If you enter a dark room and turn on the light, the light will move at the speed of light until it reaches your eye. This has been measured as you say at 'the speed of light'.

Therefore, when you turn off the light, the light will recede at the an equal speed (assuming the speed of light is constant and who am I to argue?) meaning that the speed of dark is merely the speed at which light recedes i.e. the same. This is assuming that light is not subject to the Doppler effect?

Problem solved. Next.

 

[theolodian]

This is assuming that light is not subject to the Doppler effect?

Light and the doppler effect is the basis of the theory of relativity.  That said, your answer is still valid.  

[Crazydad]

I've been following this one for a while whilst I tried to get my head round the question. My theory is as follows.

If you enter a dark room and turn on the light, the light will move at the speed of light until it reaches your eye. This has been measured as you say at 'the speed of light'.

Therefore, when you turn off the light, the light will recede at the an equal speed (assuming the speed of light is constant and who am I to argue?) meaning that the speed of dark is merely the speed at which light recedes i.e. the same. This is assuming that light is not subject to the Doppler effect?

Problem solved. Next.

 

Been working on this for Hours too. What happens then if i just close my eyes, how fast does it move then???