The biome scanner is a multiblock structure that can build built on a space station to gather info about the planet the station is currently orbiting. The biome scanner is only able to collect biome information however and simply lists what biomes have been found to generate on the planet below. It will list every biome that can be found on the planet, which with Advanced Rocketry on defaults will be no more than five. If it only displays one biome, such as with a Hot Dry Rock planet or a planet with regolith (A Moon planet), that is the only biome generated. Use this to find if you want to visit a planet or not, before you land on it with a rocket!
If it is used while warping, rumor has it that it uses the language of the cosmos itself, though that claim was made by a sentient enchanting table.