A new twist on an old experiment reveals several common-sense ideas about reality can't all be true.
Woodcut from Camille Flammarion’s 1888 book L'Atmosphère : météorologie populaire. The caption reads: ‘A missionary of the Middle Ages tells that he had found the point where the sky and the Earth touch’ and continues, ‘What is there, then, in this blue sky, which certainly exists, and which veils the stars during the day?’
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Albert Einstein may have been the ultimate example of a visionary genius, but that did not stop him from twice losing his way due to beliefs that were perhaps not so scientific.
Is dark energy just an illusion, as is often suggested? To resolve the dilemma, interpreting the basic principles of general relativity in a complex Universe may need a rethink.