A group of scientists has used starlight to test a feature of quantum mechanics that gave Albert Einstein the creeps.

Entanglement is what Einstein referred to as “spooky action at a distance.” It’s a phenomenon by which one particle can effectively “know” something about another particle instantaneously, even if those two particles are separated by a great distance. It appears to go against the idea that nothing, not even information, can travel faster than the speed of light.

Scientists who study this phenomenon want to be sure that nothing in their experimental setup is somehow creating the illusion of entanglement, perhaps via some physical mechanism or phenomenon that scientists don’t yet know about. In an effort to close a possible loophole in entanglement experiments, a group of researchers used starlight as part of their experiment. The researchers say the results of their work provide further support for this “spooky” phenomenon. [Quantum Entanglement: Love on a Subatomic Scale]

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