Wow, that’s an awesome idea! A vacuum‑proof blade would need a titanium alloy or maybe a carbon‑nanotube core, with a cooling system that runs on the ship’s power grid. I’d even throw in an energy field around the edge to cut through metal like a razor – perfect for a captain’s ceremonial weapon and a real emergency tool. Let’s sketch it out and see how we can get it to light up when you need it!