== Why the citation needed comment on Theoretical? == 

 I'm an infrequent editor of Wikipedia looking to get a better understanding of one of the tags. 

 The "Theoretical" section of this page is currently tagged as lacking citations. But this is a page listing examples of megastructures, and each of those items listed is linked to a page describing what it is, several of which define themselves as a megastructure. What kind of citation is needed to define something as an instance of something else when that is its own definition in its own entry?  

 This is one of those times when the citation needed tag seems to me to be very oddly applied, and I would like to understand what would make this section better in the eyes of other editors so I can better edit other entries.