Invisible Dark Matter May Show Up in GPS Signals

GPS satellites are crucial for navigation, but now researchers think this technology could be used for an unexpected purpose: finding traces of enigmatic dark matter that is thought to lurk throughout the universe.

Physicists estimate there is nearly six times as much dark matter in the universe as there is visible matter. But despite a decades-long search, scientists have yet to find direct evidence of invisible dark matter, and its existence is inferred based on its gravitational pull on galaxies and other celestial bodies. Without the extra force of gravity from dark matter, researchers say, galaxies wouldn't be able to hold themselves together.

Physicists don't know what dark matter is made of, but some think it's composed of particles that barely interact with the visible world, which is why dark matter is invisible and has been difficult to detect.

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