1. Someone who tried to escape Earth during The Collapse but died in the castrophe. 2. Your Ghost is a fragment of The Traveller. Using the Traveller's power it revives you, constantly. In other words your character can "die" countless times. If a Guardian loses their Ghost they cannot be revived. Eris is an example of this. 3. The Speaker is the High Priest of The Traveller. He has nothing to do with raising anyone from the dead. 4. The Aliens basically want to kill us and take our World's for The Darkness. -The Fallen are a disgraced race who once were keepers of The Traveller (Fallen call it The Great Machine) but when they started to turn to the Darkness, it abandoned them. They have been chasing it ever since, pirating and scavenging along the way. -The Hive are fanatical acolytes of the Darkness. They serve their pantheon of gods and Darkness without question, absorbing or eating any Light in their path. Their carnevous diet is there to be seen by all by all the piles of bones decorating their Fortress. -The Vex cannot be described as liking or hating anything since their are completely devoid of emotion. They bend time so they 'control' theirs and their enemies' fate. They communicate through confluxes. That's why they turned Mercury into a machine. They use one Mind to run millions of units. This proves to be both efficent and their weakness. The Heart in the garden was a particle of the Darkness. Locked out of time by the Sol Progeny. -The Cabal are a imperial military race. They serve their Emperor and their greatest leaders and tacticians are granted titles such as Valus or Val. However, they seem to running from something that drove them from their Home world. 5. Good question but it's been hinted we might get to explore The City in the future. 6. Not thr most efficent way to learn about the back story and lore of Destiny but try reading the Grimoire Cards to find out more.