yes, there is both. man-made AND ET.
i've seen craft first hand. If you study electricity or schwarzchild proton physics or spacevortex physics and look at the stuff scientists were doing in the early 1900s, they figured it out, and it all went black. ETs are 100%, but im pretty sure they arent interfering for developmental reasons. another HUGE proof is ancient civilizations and monuments, everyone even normies know the pyramids are fucking crazy.I think the japanese tried to build a 1/5 scale model pyramid and couldnt. there is a board just for this topic in the qresearch catalog under ETs, UFOs, SSP or some name like that