I'm fascinated on how bitcoin and blockchain works. So now I'm thinking if this is possible? A universal currency named Bitcoin? Being used by Asians, Blacks, Americans, Atheist, or Aliens?
Steering clear of political and speculatory arguments and roadblocks, I think the following holds:
Aliens: not really. Not with the current 10m block time. A Mars colony would already have problems there. I guess some sort of two-way pegged Marscoin could be possible. For more remote aliens, I'm not sure how far you'd be able to stretch that. Confirmations come with time, but having to wait 10 lightyears before you're safe against double spends doesn't sound all that great.
All the other groups you mentioned: yes possible and already being done.
Well there is no possibility for bitcoin to become the universal and will be only currency for the whole mankind, with current system like bitcoin have i think it looking attractive to think about but only in dreams because governments are more powerful and want to keep to control over their people so that i think it is not possible at this moment but nobody knows about future.
I don't believe it would be feasible in its current implementation considering limitation of information propagation. It takes about 10min for signal to get from Earth to the Sun. It would take light-years to communicate with nearby systems. Unless we find a hack around current physics, it won't work.
You'd need some much slower block generation times to fit the inter-planetary use :)