Comment on Dark matter scaffolding of universe detected for the first timeparentComments−lwat14yWe know this is not the case because intersteller dust absorbs light, while the dark matter does not emit or absorb light at all. The only effect we see is the gravity.−lloeki14yNot only just light (photons) but no other radiation as well (electromagnetic, like X or gamma rays), except gravity.−ordinary14yGamma rays and X-rays are photons.[0]_____[0] http://en.wikipedia.org/wiki/File:EM_Spectrum_Properties_edi...
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We know this is not the case because intersteller dust absorbs light, while the dark matter does not emit or absorb light at all. The only effect we see is the gravity.
Not only just light (photons) but no other radiation as well (electromagnetic, like X or gamma rays), except gravity.
Gamma rays and X-rays are photons.[0]
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[0] http://en.wikipedia.org/wiki/File:EM_Spectrum_Properties_edi...