Alien artifacts can only be obtained by destroying enemy spawners. They are needed for some very powerful hightech equipment, but mainly for production of Alien science packs. Artifacts can be collected by holding the "Pick up items" key (default F) and moving over them.
Recipes using alien artifacts
|Alien science pack||Portable fusion reactor||Power armor |-||Power armor MK2||Effectivity module 3||Speed module 3 |-||Productivity module 3|