You may want to put plans for building that flux capacitor on hold: A "toy" big bang created in the lab suggests time travel may not be possible after all.
In a new study, Igor Smolyaninov and Yu-Ju Hung of the University of Maryland simulated the birth of the universe using advanced materials that can bend light in unusual ways.
Their device supports the idea that the forward marching "arrow of time" cannot curve back on itself to undo events that have already happened.
So far time travel hasn't been possible in real life, Smolyaninov said, and this new material suggests it won't ever be possible.
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