The Observers were an intelligent extraterrestrial species. While there are no longer any living examples of the species, fossilized remains of the species and pictures recovered from the ruins of there civilization have allowed us to reconstruct what The Observers looked like. The average Observer stood somewhere near 7 feet tall and massed around 200 lbs. They have what is best described as an angelic humanoid appearance, possessing very thin arms and legs and a leathery set of wings that protrude from the back. The species appears mammalian, or at least mammal like, and from some of the evidence gathered they appear to have both a male and female gender.
No one is sure how large their species ever got, but Observer ruins have been found on many worlds. It is speculated by some that the Observer homeworld is New Rome, but officially, The Church claims that their homeworld has not yet been found. From what little is known about the species it seems that they lived in large cities and collected in family units somewhat similar to the Nuclear Family that is the basis of Human Civilization. No evidence of a written Observer language has ever been found, and because of this most insight into their species is at best speculative.
All modern human technology is founded on Observer relics that have been discovered in the exploration of space. It is not known how far the Observers reached technologically, but most scientists doubt that the Observers ever reached a technological level that would have allowed them to actually construct the Heaven’s Gate network. The Church has officially recognized the Observers as the creators of the Heaven’s Gate, and it is a matter of Heresy to suggest otherwise.