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Gravitational lensing

 
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Oct28-09, 10:51 PM   #1
 

Gravitational lensing

Gravitational lensing displaces the apparent direction of a star outwards away from a gravitational source. Do you think it would be possible to see the same star at least twice simultaneously, one either side of this gravitational source?
Even more likely, if the gravitational source was great enough, I would have thought that you would see a halo.

Nick
 
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Oct28-09, 10:59 PM   #2
 
Quote by Nickelodeon View Post
Gravitational lensing displaces the apparent direction of a star outwards away from a gravitational source. Do you think it would be possible to see the same star at least twice simultaneously, one either side of this gravitational source?
Even more likely, if the gravitational source was great enough, I would have thought that you would see a halo.

Nick
You would and such haloes have been seen when there's a nearby galaxy in front of a more distant one. The light has to come from almost immediately on the line of sight between the the intervening mass and the observer. A light source a bit to the side just appears as an arc of light.
 
Oct28-09, 11:30 PM   #3
 
Quote by qraal View Post
You would and such haloes have been seen when there's a nearby galaxy in front of a more distant one. The light has to come from almost immediately on the line of sight between the the intervening mass and the observer. A light source a bit to the side just appears as an arc of light.
amazing - thanks for that.
 
Oct28-09, 11:34 PM   #4
 

Gravitational lensing

Quote by Nickelodeon View Post
Gravitational lensing displaces the apparent direction of a star outwards away from a gravitational source. Do you think it would be possible to see the same star at least twice simultaneously, one either side of this gravitational source?
Even more likely, if the gravitational source was great enough, I would have thought that you would see a halo.

Nick
Yyyyyyep. Called an Einstein Ring. Google away...
 
Nov2-09, 04:09 AM   #5
 
I've seen a TV programme demonstrating the same star seen at two (near) points in the sky at the same time.
 
Nov2-09, 04:25 AM   #6
 
 
Nov3-09, 02:53 AM   #7
 
Quote by seb7 View Post
I've seen a TV programme demonstrating the same star seen at two (near) points in the sky at the same time.
Do you remember what the TV programme was called and when it was shown?
 
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