Quote:
Originally Posted by xelasnave
Is it not the case that the dark matter is "drawn" in??? in other words the region it is supposed to represent in the photo has been added by reasoning that it must be where it is and so they colour it in that way...it is something we can not see or detect so how else does it appear such we can now see it..not from direct photography I suggest....rather I believe... anyways I think if they draw it in by inference that is a long stretch really...its presence is determined by gravitational influences indicating it is there...but we still do not see it.... if gravity works by push maybe there is no dark matter at all....oif course I was always going to say that....
Magic photo... how small are we...beyond our comprehension
alex
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You are clutching at straws Alex.
Dark matter (and ordinary matter) can be detected by gravitational lensing.
The ordinary matter at the centre is simply gravitational
attraction at work. The distribution of dark matter on either side indicates the direction of movement is largely perpendicular to our line of sight.
The fact that the dark matter component of each cluster has passed through each other is a strong indication that dark matter is largely composed of WIMPS.
A picture tells a thousand words.
Regards
Steven