Light’s weird dual nature weathers trip to space and back

‘Delayed-choice’ test, a first with spacefaring photons, affirms light can behave like a wave or a particle

experimental setup

THERE AND BACK AGAIN  Light retains a double life, acting like either a particle or a wave. To test this idea in space, scientists sent light through a setup (shown) to a satellite and back.

QuantumFuture Research Group/University of Padova-DEI 2017  

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