A homogeneous cosmology is one in which there are no "special" places in the universe: at a given instant in time, the universe appears the same at every location (on large enough spatial scales).

An isotropic cosmology is one in which there are no "special" directions: at a given instant in time, the universe appears the same in every direction (again, on sufficiently large spatial scales).

Together, they form the Cosmological principle.

As pointed out by Brian Hooper, these symmetries (when applied to physical laws) give rise to the conservations of linear and angular momentum as a result of Noether's theorem.

In addition, the cosmological principal is important for the physical interpretation of observational data, and not only because it is a generally unspoken assumption when using physical laws tested on Earth to model distant objects (galaxies, quasars, etc.) For example, it supports the interpretation of the Hubble diagram as the result of the expansion of the universe as opposed to evidence that the Earth (or someplace "nearby") was at the center of a very big conventional explosion. After all, in a conventional explosion, the fragments that travel the farthest are those that had the highest velocity, so some time after the explosion, faster moving fragments are further away from the center. If, however, observers on all fragments see the same density of galaxies and relationship between velocity and distance in all directions, then this model doesn't work.

What is meant when it is said that the universe is homogeneous and isotropic?
In A Nutshell: This is a question regarding the acceptance of asking instances related to esoteric programming languages, such as: 


Brain@%#!
Ook!
LOLCODE
Omgrofl
Whitespace


Historical Significance

Proof of (real-world) usage of esoteric languages lies inside the following quote:


  The game Lost Kingdom won the First Annual Classic 2k Text Adventure Competition in 2004, and has been (re)written and enhanced by the original author in brain@%#!


Source: The Lost Kingdom Brain@%# Edition

This shows that esoteric programming languages can actually be used to develop real-world applications.

Actual Questions Relating To Esoteric Programming Languages


Practical COW example program?
What good is the NERFIN loop operation in LOLCODE?
brain%!@# greater sign


The Big Cookie

Now for the moment we've all been waiting for...

Are esoteric programming languages acceptable programming questions or discouraged?
