I'm currently towards the end game of SE, I have discovered 57 of the pyramids, but i have seen videos about the ruins where you can find things as well. How do you find those, Is it through the Zone discovery or is it just on random planets?

https://preview.redd.it/9ilizf7i0rxh1.png?width=1176&format=png&auto=webp&s=bc2a52edfed9da37192adb0c13446944b136dde8

Example