I heard somewhere about what will happen in future episodes. The thing is that I forgot where I heard it from. I don't know if it was in an episode or if I had a dream or if I read it somewhere. Well here is what I have heard.
***SPOILER***
Avatar aang asks avatar roku if they can block out the comet like the eclipse did with the sun
Is this true? Or we won't know for sure untile the future.