NASA's Jan McGarry (left) and Stephen Merkowitz stand next to the Next-Generation Satellite Laser Ranging system, one of the ground stations that makes up the quadrangle of instruments known as the Space Geodesy project, as it peeks through the station's
Credit: NASA/GSFC/Elizabeth Zubritsky
Before our Global Positioning System navigation devices can tell us where we are, the satellites that make up the GPS need to know exactly where they are.
From Jet Propulsion Laboratory / NASA
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