Did aliens build the pyramids?

One of the biggest mysteries of the world, and it’s still not proven how the pyramids were built. When you actually think about it, it does seem quite impossible to imagine the Egyptians moving these massive blocks across the country let alone stacking them in a pyramid shape, in the exact center of Earths land mass, with each side facing North, East, South and West perfectly (without the help of compasses which were yet to be invented) and lining up perfectly with Orions belt.

Another strange coincidence is the fact that, despite Egyptians kept a record of everything, every king, every building, every tomb etc., no record has ever been found that states when, where, how, why or who built these great pyramids.

So why am I talking about pyramids on a blog about UFO’s and Aliens? Well a lot of people believe that aliens are in fact responsible for building these great pyramids. Aliens would have had the technology needed to build these structures, they would have been able to view the earth from the sky, which would have helped calculate the exact middle of Earths land mass not to mention finding out which way was North. They also would have a lot of knowledge of the stars which would help them line up the pyramids with Orions belt and other astronomical coincidences.

So, are aliens the only possible explanation of how the pyramids were built? What do you think?