Summary

As the United States and the world discuss the possibility of conflict extending into space, it is important to have a general understanding of what is physically possible and practical. Scenes from Star Wars, books, and TV shows portray a world very different from what we are likely to see in the next 50 years, if ever, given the laws of physics. To describe how physics constrains the space-to-space engagements of a conflict that extends into space, this paper lays out five key concepts: satellites move quickly, satellites move predictably, space is big, timing is everything, and satellites maneuver slowly. It is meant to be accessible to policymakers and decisionmakers, helping to frame discussions of space conflict. It does not explore geopolitical considerations.