How were the Pyramids at Giza built?

Encyclopedia of Opinion

Question: How were the Pyramids at Giza built?
Position‹4 of 4: The Ancient Aliens Theory

Extraterrestrials may have visited Earth in ancient times, imparting the knowledge needed to construct the pyramids. It is possible the ancient aliens left clues to their visit encoded in the pyramids' structure.

Supporting arguments · 2

Humans did not have the technology or knowledge to build the pyramids
The Pyramids of Giza were a massive undertaking constructed from super-hard granite, with blocks weighing up to 60 tons. Ancient humans would not have been able to cut and move the blocks without alien intervention.
The Pyramids are connected to certain scientific and astronomical phenomena
The Pyramids at Giza line up with Orion's belt and true north, and have some suspiciously clever coordinates. Enthusiastic ufologists claim these are not coincidences but proof of the celestial origins of Egypt's most famous monuments.