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expanding references
|accessdate=2012-10-14
|accessdate=2012-10-14
|url=http://www.youtube.com/watch?v=jWaOyy3WfWk
|url=http://www.youtube.com/watch?v=jWaOyy3WfWk
|quote=Clusters must be held together by the gravity of unseen "Dark Matter"}}</ref>
|quote=So how he did discover the Dark Matter? He was the first astronomer to study the clusters of galaxies. Clusters of galaxies are joint collections of 2000 or 3000 galaxies. F.Zwicky measured how fast these galaxies are moving. tousend of km per second ...He asks himself if these galaxies are moving so fast, what keeps the clusters together? And the answer is: Should be gravity, the gravity is a universal glue that holds things together. The planets in our solar system move fast, not quite this fast, and it is the gravity of our Sun that holds the Solar system together. There was litle problem though: If you add up all the gravity of all the stars in all the galaxies it is not enough to hold the clusters together - it is off by factor of 50. Zwicky was bold enough to say that clusters must be held together by the gravity of unseen "Dark Matter".}}</ref>
Nowadays there is an ongoing controversy taking place about the detectability status of Dark Matter. While proponents of the Friedmann Big Bang cosmologies supplied several papers (the most recent one (2012) published in [[Nature (journal)|journal Nature]]<ref name="Nature">{{cite web
Nowadays there is an ongoing controversy taking place about the detectability status of Dark Matter. While proponents of the Friedmann Big Bang cosmologies supplied several papers (the most recent one (2012) published in [[Nature (journal)|journal Nature]]<ref name="Nature">{{cite web
|author=Zeeya Merali
|author=Zeeya Merali
|doi=10.1038/nature.2012.10951
|doi=10.1038/nature.2012.10951
|url=http://www.nature.com/news/dark-matter-s-tendrils-revealed-1.10951
|url=http://www.nature.com/news/dark-matter-s-tendrils-revealed-1.10951
|quote=}}</ref><ref name="Dietrich">{{cite web
|quote=The team's computer simulations suggest that roughly another 10% of the mass could be due to visible stars and galaxies. The bulk, therefore, must be dark matter, says Dietrich.}}</ref><ref name="Dietrich">{{cite web
|author=Jörg P. Dietrich et al.
|author=Jörg P. Dietrich et al.
|title=A filament of dark matter between two clusters of galaxies
|title=A filament of dark matter between two clusters of galaxies