Did aliens make the pyramids?

Modern science has yet to figure out how exactly the great pyramids were made. There are many theories surrounding how they were made, but after taking into consideration the sheer size they are and the time that was required to build them, it is possible that at the rate human would've worked at, it may have been impossible to make a pyramid in the lifetime of a pharaoh so that they could bury them there, so here are a few pieces of evidence that might suggest the pyramids are more then a burial tomb for some important people. Now like most people reading this, I cant say I exactly believe that aliens came down from the sky and did it, but there are a few interesting facts that may cause you to think twice. And before you go saying aliens don't exist, just consider the sheer size of the universe, but ill leave that for later because that's another argument in itself

The Egyptians were known to be an extremely organized culture and recorded almost everything. They recorded wars, everyday life etc. If they were to write and depict something as reoccurring as their everyday life then why would they not record a great undertaking such as the pyramids. This is possibly because the pyramids were already there centuries before the Egyptians arrived.

With the technologies the Egyptians had it would have been impossible or all coincidence that the location of the pyramids just happened to be so very precise in many different aspects.
The great pyramid for example is pointed almost directly at the north pole of the earth. It is within 1/10 of a degree from pointing directly at the north pole, this would have been extremely difficult for the Egyptians to do considering compasses were not created until over a thousand years later

When examining the longitude and latitude of the location of the great pyramids it is observed that the great pyramid lies on the the 31 degrees west and 31 degrees north point. The fact that it meets on those lines would have to be an unlikely coincidence. Therefore it must be even more of a coincidence that those two lines cover the most combined area on the earth, more then any other longitudinal and latitude lines. In other words the great pyramid is located at the exact center of all the land mass in the earth.

the pyramids were also built with enormous precision, so much that the angles of each corner are exactly 90 degrees, and despite the sides being approximately 727 feet long, there is only a 2 cm difference between the length of each side

When examining the sphinx it is clear that the body is of a lion and the head seems disproportionate and awkward on the body. The body of the Sphinx shows water damage and the only time there was water in that area of Egypt was before humans existed. This is also different from rain erosion because the erosion gave evidence of flowing water not falling water, meaning it was partially submerged at a point and there have been no times that fulfill that criteria since humans were alive. It is possible that the Egyptians came by after it was built, saw the sphinx and the Pharaoh at the time had a head constructed for it and replaced the head of the lion with one they had build, explaining the awkward size. It is possible that the Egyptians stumbled upon the pyramids years after they had been built and decided to build their own.  These turned out to be the smaller pyramids, the crumbling ones and the broken one, which all happened to be built after the huge pyramids at Giza. This would explain the lack of records and drawings, because they were embarrassed  of the ones they had built and they did not build the pyramids at Giza.

Well knowing all this information about how the pyramids were so impeccably built is one thing, but the reason why aliens wanted to do this is another. The only thing i can think of is because the aliens may have done this so they could return. Imagine an alien society such as an advanced version of earth exploring for other planets. After exploring for potentially a few lifetimes they stumble upon planet that may get intelligent life later. because of the sheer difficulty of getting there they want to make something to help them if they ever want to return and maybe also leave something to from their culture or some sort of monument. From outer-space astronauts who have been to the moon observed easily being able to see the reflection of the sun of the pyramid. the pyramids could serve as a visual reference (instead of computer) so they can see from far off where to land. The pyramids facing the north could enable it to be easier for computer or compass navigation when approaching a landing. and finally the location of the pyramids would be used well to mark the landing point they are at point in the Nile where all the parts converge (allowing for easy access to water and they are in the center of the landmass of the world which could potentially contain some structural benefits for the landing of an immense space shuttle