Maybe this is a silly question (I think it is), but it's a question I'm arguing with some of my friends for a long time.
The ultimate question is: Is everything (in our Universe) possible ?
I've read some books (Penrose, Hawking, Greene, etc.) where it was clearly stated several times that quantum mechanics allows any situation to happen (e.g. everything is possible) - even with absurdly tiny probabilities?
Does this mean only physically possible - or "ultimate" possible ?
For example (I know this example seems really absurd, but I'm saying this so you get the idea) what my friends clame it is possible:
- If I ask my friend(s): "Is it possible there is a Sun-sized star in my pocket right now?" They will respond: "Yes, there is very very tiny possibility this can be true!"