The same aliens that built the Pyramids put them there.

Or, they're not humans at all. They are a species of slim molds that formed in that asteroid and they developed intelligence and radio communication. They have been listening in on human culture and they can reform themselves to be like humans.

Or, along those lines, Thera blew off a statue that the slim molds found and imitated.

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Fields of Space

LOGIC, n.
The art of thinking and reasoning in strict accordance with the limitations and incapacities of the human misunderstanding.

In the Year 2525.

"One small step for (a) man. One giant leap for mankind".

If an astronaut doesn't need good grammar, niether does you.

Host of Seraphim