In recent months, leaders in the Defense Department have highlighted the increasing importance of space as a domain of modern warfare. In April, Deputy Secretary of Defense Bob Work took the unusual step of delivering a classified speech at the annual Space Symposium to reaffirm that the U.S. military “will maintain space capabilities, through all phases of conflict, regardless of actions to deny us the ultimate high ground.” This raises an important question: How would a war in space be fought? The answer is probably not what most people would expect because the space domain is fundamentally different than other domains of warfare.