The Space Development Agency awarded contracts for the final 20 satellites in the second tranche of its proliferated low-Earth orbit constellation on Aug. 16, setting the stage for hundreds of satellites to launch in the next three years or so. 
Medium-Earth orbit—the range of space 2,000 to 35,786 kilometers above the surface mostly known as the home of GPS satellites and not much else—has been getting more and more attention from the Space Force in recent years. In its latest move, the service is eyeing ...