Are Dark Photons the 'Fifth Force' Holding Universe Together?

Are Dark Photons the 'Fifth Force' Holding Universe Together?
NASA/ESA/K. Meech, J. Kleyna - University of Hawaii/O. Hainaut - European Southern Observatory via AP

Physicists on the hunt for the invisible hand that shapes our universe and the galaxies within it have turned their gaze to the dark side. Specifically, one team is looking behind every cosmic rock for so-called dark photons, which could transmit a previously unknown force of nature.

These photons would mediate the interaction between all normal matter and the invisible stuff called dark matter. 

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