Where you can build mega-structures? (Stellaris)

Need to open the technology to do this + there is a new me where I have to choose the path of ascension.

Sanya Zarenkov
throw a picture of Technologie

Need tradition to choose

Pumped tradition to build a base in space and pumped the tradition of the mega-structures(see) and/or on the ring.
Technology shake the acceleration of the construction 25% 50% - the technology of mega-structures.
Next, begin to build.
1 measureunit on the system. The construction phased. ESTs have dohrenischscha. Mega structures 4 - the Dyson Sphere(+400 to energy) it can only be built in empty systems without colonies, a Scientific Base(like the +50 to all), Sentinel post (ohrenevshy sensor on the floor of the galaxy), Peace Ring(explains nothing).
And of the type of residential base in space for like... 16 digging with her good energy to farm there electroche as baturinska extracted.

Svarogor
The world ring around the star, a Dyson sphere and Intelligence post too. The rest on the orbits of the planets. first you need to study the technology of megaconstruction,and after you will have access to the branch bonus tradition in the construction of the megasurvey.

ManticoreX
Thank you all. Have already figured out.

LenivyiBob
put closer to the center of the galaxy and will be for the entire galaxy.

I opened tradition. A menu appeared building. Naucke and the gates built, and the others can't build.