by JohnD » Fri Jan 26, 2007 6:14 pm
kovil,
The aratcile is almost as obscure as dark matter itself!
But it does say,"The dark matter map was constructed by measuring the shapes of half a million faraway galaxies.
To reach Hubble, their light has had to travel through intervening dark matter, and the path of the light is slightly deflected by the dark matter’s gravity. The observed, subtle distortion of the galaxies’ shapes was used to reconstruct the distribution of intervening mass along Hubble’s line of sight – a method called weak gravitational lensing. "
Does that make sense to you?
I can see the idea, but I have to say that it is a bit like describing colour to the blind.
John
kovil,
The aratcile is almost as obscure as dark matter itself!
But it does say,"The dark matter map was constructed by measuring the shapes of half a million faraway galaxies.
To reach Hubble, their light has had to travel through intervening dark matter, and the path of the light is slightly deflected by the dark matter’s gravity. The observed, subtle distortion of the galaxies’ shapes was used to reconstruct the distribution of intervening mass along Hubble’s line of sight – a method called weak gravitational lensing. "
Does that make sense to you?
I can see the idea, but I have to say that it is a bit like describing colour to the blind.
John