If you don't believe that aliens built the pyramids then how do you think they appeared on earth? We still don't have the technology today to make the pyramid.

I admit that the 'gold' theory of aliens is open to different interpretations and doubt because nothing is certain. Maybe they had baggage limit when travelling so they could not bring big bulky machines who knows But the building of the pyramid is indeed something to wonder about. Specially when it was built so long ago.