My own life's exploration
"For all its material advantages, the sedentary life has left us edgy, unfulfilled." I think this is what modern existential angst is. Btw, when he talks about "other worlds", I think not just of outer space, but also inner space: wonders yet undiscovered in the depths of matter and complexity.
If you don't have a vocation/passion/goal, then I think your vocation is to be a explorer. To seek the unknown, to try new things, discover unseen worlds, ask the questions that will inspire new goals
See Cyberself, Facebook, Dropbox