A new theory pioneered by cosmologist Christos Tsagas claims that some of the most confounding observations and theories in modern physics, specifically that of an expanding universe caused by slippery dark energy, may be just an illusion created by the location of our corner of the cosmos relative to other parts. The explanation hinges on an observation known as 'dark flow' which states that our section of the universe, roughly 2.5 billion light years wide, is moving at a different speed and direction than other sections.