Micromine
this Imperial form of space mine was developed in order to prevent its detection by normal starship scanners. Each micromine was a tiny spec of anti-matter, contained within a magnetic shell. Because each micromine was so small, they were virtually undetectable. The Empire mined the space around Shiva IV with micromines to protect their interest in the system, but the full-scale use of micromines turned out to be cost-prohibitive, and the plans for mass manufcture were scrapped.