The strongest evidence till date of dark matter is considered to be the observation in 2004 of the collision of two galaxies in the “Bullet Cluster” that revealed a clear separation of dark matter and gas clouds.
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"The article makes an error, the dark matter is about 23% not 83%. It also assumes dark matter consists of real particles. I predict it's virtual particles with positive zero point vacuum fluctuation pressure, w = -1 that mimics w = 0 Cold Dark Matter (CDM)." -- Jack Sarfatti