The Riftbreaker is a tower defense survival game with a strong emphasis on base-building. If you have any hope of surviving on Galatea 37, you will want to build your base with maximum efficiency and complete your objectives. One objective that you will get early on is to build an Orbital Scanner.
To do so, you have to complete a few steps first. The first thing you will need to do is upgrade Headquarters to level two. This is a requirement to build the Communications Hub. From the Communications Hub, you have access to research. You will need to select the Orbital Scanner research to unlock the Orbital Scanner.
Related: All Biomes in The Riftbreaker
After the research is completed, you will be able to construct the Orbital Scanner building. It is in the first tab of your building menu with the Headquarters and Communications Hub. Once the building is complete, you will have completed the objective to build the Orbital Scanner.
The Orbital Scanner is a great tool for finding resources as it constantly scans the planet for resources, life forms, and artifacts. It also allows the player to complete planetary missions in the campaign. This building is one you should prioritize building and defending as it is quite important.
For more information on The Riftbreaker, check out How to craft weapons and upgrade your Mecha in The Riftbreaker and How to disassemble weapons and equipment in The Riftbreaker on Pro Game Guides.