‘SHADOW’ civilisations could exist in dark matter according to astonishing new theory DARK matter – one of the most mysterious substances known, or perhaps not known, to scientists – could harbour ‘SHADOW’ civilisations which we are unable to see, researchers have claimed. Share: Facebook Twitter Google+ Stumble Digg Email ThisBlogThis!Share to XShare to Facebook Related Posts:NASA asteroid WARNING: Space rock taller than Eiffel Tower could SLAM into Earth in AprilYellowstone volcano: How summer tourists could face 'unavoidable CATASTROPHIC effects' Indonesia volcano ERUPTION: Dire satellite photos show why Bali erupted after 50 yearsBali volcano eruption: Agung and Batur are CONNECTED - scientists warn of huge eruptionNASA Opportunity last message: What were the final heartbreaking words of the Mars rover?Meteor WARNING: Look up as bright 'spring meteor' FIREBALLS light up the night sky