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News Link • Science, Medicine and Technology

Deep Space Objects Guide Earth's GPS System

• Space
That global positioning system (GPS) that guides your car and keeps you on the map is itself guided by the positions of some of the brightest, strangest objects in the universe — quasars.

GPS satellites send signals to a receiver in GPS navigators down on Earth. These in turn calculate your position based on the location of the satellites and your distance to them.

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