If physics is not applicable to understanding the nature of the universe then we are all in a lot of trouble.
Tell me; are you in the habit of using English grammar as the ruleset for arranging Zen gardens?
Physics is topically contingent to "the physical". The Laws of Physics as we know them have further been derived through Popperian Falsification. Even within our own lightcone we still from time to time see the revival of conjecture as to whether the gravity constant or others are actually constant or if they vary from one region to another. Because nothing outside our lightcone interacts with us, we have no way of knowing which, if any, of the Laws of Physics we yet have are applicable. We can assume -- certainly -- but this does not inform us of anything other than our assumptions. Conjecture without corroboration is not derived information on the subject matter.
And all of this is even assuming that there's "physical" out there at all. Which, again, because it is not observable -- we have no way of knowing at all. It could be nothing. It could be a micron larger than our lightcone. It could be a mile. Or it could be infinite. Or, under certain even more bizarre conceptions (involving inversions of topology and strange physics), there could conceivably even be less than what we observe.
All of this without getting into philosophical "trickery" such as the simulated universe argument.
So, yes. Physics is not applicable to answering the question "what is there beyond the Earth's Lightcone?".
It could be a micron larger than our lightcone. It could be a mile. Or it could be infinite.
I don't know precisely how likely these three options are, but infinite seems astronomically more likely that any arbitrary amount.
Often, there are questions you want to know the answers to. You want other people's opinions, because knowing the answer isn't worth the time you'd have to spend to find it, or you're unsure whether your answer is right.
LW seems like a good place to ask these questions because the people here are pretty rational. So, in this thread: You post a top-level comment with some question. Other people reply to your comment with their answers. You upvote answers that you agree with and questions whose answers you'd like to know.
A few (mostly obvious) guidelines:
For questions:
For answers:
This thread is primarily for getting the hivemind's opinions on things, not for debating probabilities of propositions. Debating is also okay, though, especially since it will help question-posters to make up their minds.
Don't be too squeamish about breaking the question-answer format.
This is a followup to my comment in the open thread.