Earth Is Being Tracked By Giant Brass Orbs

These two satellites are essentially massive, hollow brass balls covered in mirrors. They have no power or instruments, yet they act as precise reference points to measure how the Earth's crust shifts over decades.

Unlike typical satellites full of complex electronics and sensors, these were designed to be incredibly simple and stable. By bouncing lasers off their 426 glass prisms, scientists can track the movement of continents with millimeter precision. They act as stationary anchors in space, helping us map how our planet moves and changes shape. Because they are so heavy and dense, they remain in orbit for millions of years.