Your character has no memories of what they were before the Ghost revived them so why would you know? The Traveler is an interstellar being capable of terraforming worlds, and apparently bestowing it's technology unto others. They did try to invade the last city on Earth. In the Battle of the Twilight Gap they united and attempted to take the city. The Vanguard managed to push them back however. The Awoken in the Reef regard the Awoken on Earth as outsiders since they decided to help humanity on Earth rather than their Empire in the asteroid belt. The Queen has Fallen guards because she controls the House of Wolves. She controls the House of Wolves because she killed their Kell, and they decided to follow her. All of this is in game if you pay attention. It's expanded upon more in the Grimoire cards as well, which admittedly should be included in the game, not separately. Not many people have the desire to read through hundreds of cards on a separate website when it probably should have been included in the game in the first place. I got stuck in a hospital all day though, so I figured what the Hell?