The three Giza pyramids are precisely aligned with the constellation of Orion, which could have been the intention of the builders because the stars of Orion were associated with Osiris, the god of rebirth and afterlife, by the Ancient Egyptians.
While experts usually agree on the hypothesis - that the pyramids were built from huge stones carved with copper chisels from stone quarries - the methods used to move and place the stones remain the matter of further debates and speculations.
It is hard to determine the exact number but the weight of the Pyramid of Cheops is estimated to be about 6 million tons.
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