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Author Topic: lensing efect  (Read 3363 times)

Offline ukmicky

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lensing efect
« on: 24/06/2006 16:29:16 »
The mass of the sun curves and warps space far beyond the orbit of our planet and so due to our proximaty to the sun could their be a lensing effect on our view of the rest of the galaxy and universe. Could we sort of be within the lens if you get what i mean, meaning our view of everything is altered from true reality.

Michael
« Last Edit: 24/06/2006 16:39:13 by ukmicky »


 

Offline Roy P

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Re: lensing efect
« Reply #1 on: 24/06/2006 17:46:15 »
I'd say, most definitely, Michael. However, the effect, I would imagine, is slight. And, if anything, the gravity of the Earth would have more effect than the Sun?

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Offline neilep

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Re: lensing efect
« Reply #2 on: 24/06/2006 18:26:26 »
I've heard all about this lensing stuff !...I would agree that I suspect the Sun just ain't that large enough (or dense enough) to warp the view that greatly !

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Re: lensing efect
« Reply #3 on: 26/06/2006 14:44:47 »
quote:
Originally posted by neilep

I've heard all about this lensing stuff !...I would agree that I suspect the Sun just ain't that large enough (or dense enough) to warp the view that greatly !



The 1919 solar eclipse was used to show the gravitational lensing by our sun,
 (you're right Neil, it is a subtle but measurable effect):-

"Observe during a total eclipse, when the Sunís light is blotted out for a few minutes, and you can see distant stars that appear close to the Sun in the sky. If Einstein was right, the Sunís gravity would shift these stars to slightly different positions, compared to where they are seen in the night sky at other times of the year when the Sun far away from them. The closer the star appears to the Sun during totality, the bigger the shift would be."
http://www.firstscience.com/site/articles/coles.asp
« Last Edit: 26/06/2006 14:45:37 by ROBERT »
 

Offline Soul Surfer

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Re: lensing efect
« Reply #4 on: 30/06/2006 10:09:19 »
Gravitational lensing does have an effect on our view of the universe but only over very small angles,  seconds of arc, like the effect of the sun  lensing efects are used in astronomy to observe things that would otherwise not be observable.  For example the gravitational effect of large galaxies and clusters of galaxies can show us galaxies at much greater distance by focussing their light in our direction.  

There is also a research project looking for small planets and stars by using their gravitational lensing effects to cause background stars to brighten and darken in a particular pattern.  It has come up with several examples already.

I expect that in a few years when our ability to map the details of the cosmic microwave background radiation gets to a fine enough resolution gravitational lensing will tell us a lot more about the basic structure of dark matter within the universe.

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Offline Soul Surfer

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Re: lensing efect
« Reply #5 on: 30/06/2006 10:09:19 »
Gravitational lensing does have an effect on our view of the universe but only over very small angles,  seconds of arc, like the effect of the sun  lensing efects are used in astronomy to observe things that would otherwise not be observable.  For example the gravitational effect of large galaxies and clusters of galaxies can show us galaxies at much greater distance by focussing their light in our direction.  

There is also a research project looking for small planets and stars by using their gravitational lensing effects to cause background stars to brighten and darken in a particular pattern.  It has come up with several examples already.

I expect that in a few years when our ability to map the details of the cosmic microwave background radiation gets to a fine enough resolution gravitational lensing will tell us a lot more about the basic structure of dark matter within the universe.

Learn, create, test and tell
evolution rules in all things
God says so!
 

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Re: lensing efect
« Reply #5 on: 30/06/2006 10:09:19 »

 

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