Atomic's Space Expansion

The mod's blocks are plain building pieces meant for constructing spacecraft, space stations and similar builds. Insulating foam blocks come in 16 dye colors and can be crafted, while MLI foil blocks exist in gold, silver and copper variants, with silver made by mixing other metals and a yellow or orange dye option for the foil. Other pieces include a solar array, a brushed metal finish, a shiny metal finish and a shiny metal window.

The pack also includes black and white cover panels, in plain and ribbed forms. The author notes that it works on its own, but it is meant to be used alongside mods such as Valkyrien Skies 2 and Create, and pairs well with Copycats+ and Create to fit out vehicles and stations. Client and server both need the mod, so every player on a server that runs it must install it too. The code is released under the MIT License, and the project is not open source. Files exist only for 1.20.1, and the latest Forge build is 0.1.0 for 1.20.1, published on 2026-01-17 on the beta channel. The author has stopped working on the mod, having moved on to other space projects.