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Mystery surrounding construction of Pyramids solved?

History

As I was browsing BBC news this morning, I found this super interesting article: "Scientists may have solved mystery behind Egypt's pyramids" (Link). As I am very interested in this particular remaining Wonder of the World, I had a look.

In essence, there has been a multi-continental effort to find traces that could find clues or even an explanation how these massive structures were built, and it seems they found a major piece of the puzzle. The article reads:

In a cross-continental effort, the group of researchers used radar satellite imagery, historical maps, geophysical surveys, and sediment coring (a technique used by archaeologists to recover evidence from samples) to map the river branch - which they believe was buried by a major drought and sandstorms thousands of years ago.

The team were able to "penetrate the sand surface and produce images of hidden features" by using the radar technology, the study, published in the journal Nature, said.

Among those features were "buried rivers and ancient structures" running at the foothills of where the "vast majority of the Ancient Egyptian pyramids lie," Prof Ghoneim said.

Speaking to the BBC, one of the study's co-authors, Dr Suzanne Onstine, said "locating the actual [river] branch and having the data that shows there was a waterway that could be used for the transportation of heavier blocks, equipment, people, everything, really helps us explain pyramid construction".

Courtesy Nature magazine

If this is true, it could shed some light on how the massive stones were transported to the construction site.

The full study is found here - (Link)

It does not, however, some one of the greatest mysteries around: how did the Egyptians manage to 1) align the structure/s to perfect north, 2) get them into their shape, and 3) align them perfectly with constellations.