Weaponizing space sounds like science fiction until you look at what the Pentagon and its rivals have actually studied. This episode of The Universe surveys the hardware proposed for orbital warfare, starting with kinetic bombardment: tungsten rods the size of telephone poles, dropped from satellites to strike the ground with the force of a small nuclear weapon and no fallout. From there it moves through ground-based lasers designed to blind or destroy satellites, anti-satellite missiles, and other systems meant to fight for control of orbit itself. Physicists and military analysts weigh which of these ideas are engineering problems waiting to be solved and which run into physics or cost that make them closer to fantasy. The throughline is strategic: whoever controls the space above a battlefield controls communications, navigation, and reconnaissance below it, which is why militaries keep returning to these concepts even when the technology lags behind the ambition. The episode treats orbital weapons as a live planning question rather than a hypothetical one.