article_snippet: Scroll down for video .
article_snippet: This has been described as a kind of 'cosmic treacle' across the universe.
article_snippet: – the 'hearts of atoms'
article_snippet: – at close to the speed of light, recreating conditions that existed a fraction of a second after the Big Bang.
article_snippet: a recognisable footprint was found in 2012. '
article_snippet: Or is it just a hole?
highlights_snippet: Author and physicist 