THE STORY OF RA
The species known as the Goa'uld were dying out, their sun had gone nova. Ra traveled the galaxy looking for a way to keep himself alive, and found the planet that came to be known as the Tau'ri, and later known as Earth. The species he found there, humans, could be taken as hosts, and were easy to repair by the technology known as the sarcophagas. He took a human as his host, then took more and populated the galaxy with them as his slaves. Others of his species began using humans as hosts.

          After awhile, though, the original Tau'ri figured out that Ra and the other Goa'uld were not gods. The rebelled and buried the Stargate, and the Goa'uld did not come in ships because they already had more than enough slaves.