Researchers in Switzerland and the UK detected dark matter in clusters . They discovered that dark matter ' particles ' pass through themselves . This suggests dark matter could not actually be composed of particles . It could instead be like a ' fluid ' , or something else entirely . ' We are challenging many aspects of dark matter , ' lead # Dr ##eson # reporters .
Researchers in Switzerland and the UK mapped dark matter in clusters . They discovered that dark matter 'particles ' pass through themselves . This suggests dark matter may not actually be composed of particles . It could instead be like a 'fluid ' , or something else entirely . 'We are challenging many models of dark matter , ' lead author Dr Harvey told MailOnline .