Metal is one of the most important materials in the Void, being one of the most used resources in the game. There are various ways to aquire metal, such as extracting it from Asteroids or Space Junk /Wrecks.
You can get a great quantity of metal if you find a Asteroid Field. Due to the rarity of those, a large number of players try to colonize/protect Asteroid Fields. Because of this, some prefer obtaining metal by destroying Nanobot structures or other Players, as they explode and drop wrecks that can be harvested for metal.