Stellar test of quantum spookiness. Physicists have for the first time harnessed distant starlight to bolster the case for the spooky quantum phenomenon known as entanglement. Quantum physics suggests that two entangled particles can maintain a special connection such that if one is measured, the property of the other appears instantly affected — even at a large distance. Einstein disliked the notion and believed that the outcomes depend on some predetermined, but hidden, variables. Now, in a version of an iconic experiment called a Bell test, physicists use light emitted by stars around 600 years ago to limit the possibility that predetermined variables are involved. (Nature news story; Read Nature’s feature: ‘Quantum physics: What is really real?’)
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