There was a sci fi book that came out a few years ago that I would like to read but I have forgotten the title. It was about the Earth in the future where aliens have come to us and offered us immortality. I remember the cover of the book had like towers? or some sort of tall buildings on it. It came out a few years ago (2009-2010) I think. If anyone knows what I am talking about please let me know. Thank you!